{"id":96599,"date":"2020-11-24T22:43:12","date_gmt":"2020-11-24T22:43:12","guid":{"rendered":"https:\/\/raed.academy\/?p=96599"},"modified":"2020-11-25T16:19:38","modified_gmt":"2020-11-25T16:19:38","slug":"propostes-contra-el-canvi-climatic-jose-maria-baldasano","status":"publish","type":"post","link":"https:\/\/raed.academy\/ca\/propostes-contra-el-canvi-climatic-jose-maria-baldasano\/","title":{"rendered":"Propostes contra el canvi clim\u00e0tic"},"content":{"rendered":"<p><em><a href=\"https:\/\/raed.academy\/ca\/academics\/dr-jose-maria-baldasano-recio\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Jos\u00e9 Mar\u00eda Baldasano<\/strong><\/a><\/em><br \/>\n<em>Catedr\u00e0tic em\u00e8rit d&#8217;Enginyeria Ambiental de la Universitat Polit\u00e8cnica de Catalunya, consultor de el Programa de les Nacions Unides per al Medi Ambient i acad\u00e8mic de n\u00famero de la Reial Acad\u00e8mia Europea de Doctors-Barcelona 1914 (RAED)<\/em><\/p>\n<p>J<strong>os\u00e9 Mar\u00eda Baldasano<\/strong>, catedr\u00e0tic d&#8217;Enginyeria Ambiental de la<strong> Universitat Polit\u00e8cnica de Catalunya<\/strong> i acad\u00e8mic de n\u00famero de la <strong>Reial Acad\u00e8mia Europea de Doctors-Barcelona 1914<\/strong> (RAED), comparteix amb la comunitat acad\u00e8mica l&#8217;informe que ha enviat a la <strong>Comissi\u00f3 d&#8217;Emerg\u00e8ncia Clim\u00e0tica<\/strong> del <strong>Parlament de Catalunya<\/strong> com a expert independent a petici\u00f3 d&#8217;aquest organisme constitu\u00eft el passat mes de juliol.<\/p>\n<h3>Informe sobre el canvi clim\u00e0tic<\/h3>\n<h4>Clarificaci\u00f3 pr\u00e8via<\/h4>\n<p>Estem actualment en un canvi clim\u00e0tic, que t\u00e9 dues caracter\u00edstiques pr\u00f2pies molt especials, est\u00e0 sent for\u00e7at per l&#8217;esp\u00e8cie humana en un per\u00edode de temps curt\u00edssim fora d&#8217;escala geol\u00f2gica i clim\u00e0tica coneguda. Per aquestes especials caracter\u00edstiques s&#8217;ha convertit en una emerg\u00e8ncia clim\u00e0tica. &#8220;L\u2019actual canvi clim\u00e0tic&#8221; \u00e9s el problema, el terme &#8220;emerg\u00e8ncia clim\u00e0tica&#8221; indica la situaci\u00f3 temporal urgent de resposta a aquest problema.<\/p>\n<h4>Diagn\u00f2stic<\/h4>\n<p>D\u00e8cades de mesures i investigacions cient\u00edfiques sobre el clima permeten concloure clarament, sense discussi\u00f3, que:<\/p>\n<ul>\n<li>Les temperatures globals de l&#8217;atmosfera i dels oceans estan pujant, especialment a la zona \u00e0rtica. Les temperatures continuaran augmentant. L&#8217;escalfament indu\u00eft pels \u00e9ssers humans es superposa a un clima naturalment variable, l&#8217;augment de temperatura no ha estat, i no ser\u00e0, uniforme o parell per tots els pa\u00efsos o amb el temps.<\/li>\n<li>Un recent estudi del glaci\u00f2leg Jordi Camins apunta que des de l&#8217;era preindustrial fins ara l&#8217;augment de la temperatura a les cotes altes de Pirineu seria de 2,9\u00baC, molt per sobre de l&#8217;augment de 1,1\u00baC a escala global. Resultat equivalent als trobats en altres zones de muntanya. Tamb\u00e9 estima que, si es mant\u00e9 la tend\u00e8ncia actual, en 2040 ja no quedar\u00e0 cap de las 20 glaceres que encara sobreviuen als Pirineus i que cap al 2050 desapareixerien tamb\u00e9 les congestes de gel en el qual s&#8217;haurien convertit aquestes glaceres.<\/li>\n<li>Les mesures de temperatura de l&#8217;aigua de mar davant de les illes Medes, des de fa anys, a nivell de la costa de Catalunya ho estan corroborant, no nom\u00e9s en superf\u00edcie sin\u00f3 tamb\u00e9 en profunditat, la qual cosa \u00e9s molt m\u00e9s greu.<\/li>\n<li>L&#8217;oce\u00e0 s&#8217;ha escalfat progressivament des de 1970 i ha absorbit m\u00e9s del 90% de l&#8217;exc\u00e9s de calor acumulat per el sistema clim\u00e0tic. Des de 1993, la taxa d&#8217;escalfament dels mars s&#8217;ha duplicat, i des de 1982, les &#8220;onades de calor&#8221; dins el mar s&#8217;han duplicat en freq\u00fc\u00e8ncia i intensitat. A m\u00e9s, a l&#8217;absorbir m\u00e9s CO2, les aig\u00fces s&#8217;estan tornant m\u00e9s \u00e0cides i perden l&#8217;oxigen vital per als ecosistemes que l&#8217;habiten.<\/li>\n<li>En les \u00faltimes d\u00e8cades, l&#8217;escalfament global ha redu\u00eft el volum de gel de la criosfera del planeta, amb p\u00e8rdues significatives en les capes de gel i de les glaceres, el que provoca una forta reducci\u00f3 en la cobertura de neu de les muntanyes. Tamb\u00e9 s&#8217;ha redu\u00eft el gel mar\u00ed de l&#8217;\u00c0rtic i la temperatura que afecta al &#8216;permafrost&#8217;. Aix\u00f2 genera greus impactes negatius com la pujada del nivell de la mar, els recursos h\u00eddrics i la seva disponibilitat, en la qualitat de l&#8217;aigua, &#8230; S&#8217;espera que l&#8217;oce\u00e0 \u00c0rtic es quedi sense gel a l&#8217;estiu cap a mitjans d&#8217;aquest segle XXI.<\/li>\n<li>El nivell global de la mar continua augmentat, amb una acceleraci\u00f3 en les d\u00e8cades recents, per la dilataci\u00f3 t\u00e8rmica dels oceans i mars i per p\u00e8rdua cont\u00ednua del gel de les glaceres i de Groenl\u00e0ndia. El nivell de la mar ha augmentat 4,8 mil\u00b7l\u00edmetres per any de mitjana en els \u00faltims 10 anys, una taxa molt m\u00e9s alta que en les 2 d\u00e8cades anteriors. S&#8217;espera en aquest segle XXI un augment mitj\u00e0 del nivell de mar d\u20191 m. Les zones costaneres ja estan patint una forta pressi\u00f3, potenciades per les marejades.<\/li>\n<li>La durada de la temporada sense gelades i la corresponent temporada de cultiu s&#8217;ha incrementat des de la d\u00e8cada de 1980. Es preveu que la temporada de cultius continu\u00ef perllongant-se.<\/li>\n<li>La intensitat, freq\u00fc\u00e8ncia i durada dels huracans de l&#8217;Atl\u00e0ntic Nord, aix\u00ed com la freq\u00fc\u00e8ncia dels m\u00e9s forts (de categories 4 i 5), s\u2019ha incrementat des de principis de la d\u00e8cada de 1980. La relativa contribuci\u00f3 de l&#8217;activitat humana i de les causes naturals amb aquests augments segueix sent incerta. Es prediu que les taxes de precipitacions i d&#8217;intensitat de les tempestes associades amb huracans augmentaran a mesura que el clima continu\u00ef escalfant-se, especialment als oceans.<\/li>\n<\/ul>\n<p>Hi ha diversos punts d&#8217;inflexi\u00f3 clim\u00e0tica que generen un fort nivell d&#8217;inquietud:<\/p>\n<ul>\n<li>El col\u00b7lapse de les grans masses de gel, especialment de la zona \u00e0rtica, pel desgla\u00e7 de Groenl\u00e0ndia.<\/li>\n<li>L\u2019enfortiment dels processos de retroalimentaci\u00f3 positiva, tant els d&#8217;amplificaci\u00f3 lenta com r\u00e0pida.<\/li>\n<li>L\u2019escalfament global continuat i a llarg termini si no hi ha una urgent i r\u00e0pida reducci\u00f3 d&#8217;emissions.<\/li>\n<li>Els canvis a gran escala en la circulaci\u00f3 oce\u00e0nica (circulaci\u00f3 termohalina). Ja hi ha indicacions clares de l&#8217;afebliment de l&#8217;enfonsament d&#8217;aigua a la zona de l&#8217;Atl\u00e0ntic Nord (AMOC).<\/li>\n<\/ul>\n<div id=\"attachment_96554\" style=\"width: 260px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-96554\" class=\"wp-image-96554\" src=\"https:\/\/raed.academy\/wp-content\/uploads\/2020\/11\/Jose-Maria-Baldasano.jpg\" alt=\"Dr. Jos\u00e9 Mar\u00eda Baldasano\" width=\"250\" height=\"376\" aria-describedby=\"caption-attachment-96554\" data-attachment-id=\"96554\" data-permalink=\"https:\/\/raed.academy\/propuestas-contra-el-cambio-climatico-jose-maria-baldasano\/jose-maria-baldasano-2\/\" data-orig-file=\"https:\/\/raed.academy\/wp-content\/uploads\/2020\/11\/Jose-Maria-Baldasano.jpg\" data-orig-size=\"270,406\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Jose-Maria-Baldasano\" data-image-description=\"\" data-medium-file=\"https:\/\/raed.academy\/wp-content\/uploads\/2020\/11\/Jose-Maria-Baldasano.jpg\" data-large-file=\"https:\/\/raed.academy\/wp-content\/uploads\/2020\/11\/Jose-Maria-Baldasano.jpg\" \/><p id=\"caption-attachment-96554\" class=\"wp-caption-text\">Dr. Jos\u00e9 Mar\u00eda Baldasano<\/p><\/div>\n<p>Aquest somer diagn\u00f2stic es deriva dels seg\u00fcents informes:<\/p>\n<p><em>Informes del Intergovernmental Panel on Climate Change \u2013FAR, SAR, TAR, AR4 y AR5- (IPCC) https:\/\/www.ipcc.ch\/<\/em><br \/>\n<em>Informes sobre el canvi clim\u00e0tic a Catalunya (http:\/\/cads.gencat.cat\/ca\/detalls\/detallarticle\/Tercer-informe-sobre-el-canvi-climatic-aCatalunya-00003).<\/em><br \/>\n<em>Informaci\u00f3 que pot ser trobada i contrastada en les seg\u00fcents p\u00e0gines web:<\/em><br \/>\n<em>UE Copernicus: https:\/\/climate.copernicus.eu\/<\/em><br \/>\n<em>EEA (European Environmental Agency): https:\/\/discomap.eea.europa.eu\/Index\/<\/em><br \/>\n<em>WMO (World Meteorological Organization): https:\/\/public.wmo.int\/en\/our-mandate\/climate<\/em><br \/>\n<em>NASA The Effects of Climate Change: https:\/\/climate.nasa.gov\/effects\/<\/em><br \/>\n<em>NOAA climate: https:\/\/www.climate.gov\/<\/em><br \/>\n<em>A pragmatic guide to state of Climate Change: https:\/\/www.tmrow.com\/climatechange.html<\/em><\/p>\n<h4>La seva incid\u00e8ncia al temps<\/h4>\n<p>\u00c9s molt important ser conscients, que l&#8217;actual alteraci\u00f3 clim\u00e0tica es realitza mitjan\u00e7ant processos de tipus exponencial, no lineal, amb processos que s\u00f3n majorit\u00e0riament de retroalimentaci\u00f3 positiva, \u00e9s a dir, que s&#8217;amplifiquen i especialment s&#8217;acceleren en el seu desenvolupament en el temps. \u00c9s a dir, no \u00e9s una cosa que vindr\u00e0 en els anys futurs, sin\u00f3 que ja \u00e9s aqu\u00ed. La fase inicial del proc\u00e9s ja l&#8217;hem consumit, el proc\u00e9s ja s&#8217;est\u00e0 accelerant i els efectes es van agreujar cada vegada m\u00e9s.<\/p>\n<h4>La causa principal \u00e9s l&#8217;acceleraci\u00f3 de l&#8217;activitat humana<\/h4>\n<p>La gran acceleraci\u00f3 en creixement de poblaci\u00f3 i d&#8217;activitat econ\u00f2mica que es va produir a partir de l&#8217;any 1750, des del descobriment de la m\u00e0quina de vapor, per\u00f2 especialment a la segona meitat de segle XX, ens ha portat a desajustar el cicle del carboni, mitjan\u00e7ant l&#8217;\u00fas desaforat dels combustibles f\u00f2ssils, com a conseq\u00fc\u00e8ncia del model energ\u00e8tic adoptat, complementat per processos de desforestaci\u00f3 -mitjan\u00e7ant l&#8217;incendi de les selves equatorials: Amazoni\u00e0, \u00c0frica central, Sud-est asi\u00e0tic-, que es converteixen en una altra font d&#8217;emissi\u00f3 de CO2 i altres gasos d&#8217;efecte hivernacle CH4 i N2O especialment.<\/p>\n<h4>Projecci\u00f3 de futur<\/h4>\n<p>S&#8217;ha portat a terme una projecci\u00f3 a futur fins a l&#8217;any 2050 de l&#8217;evoluci\u00f3 de la temperatura i la precipitaci\u00f3 mitjana anual per a Catalunya, resultats obtinguts amb una resoluci\u00f3 de mallat de 10&#215;10 km2, considerant diferents escenaris d&#8217;emissi\u00f3 de gasos d&#8217;efecte hivernacle. El per\u00edode d&#8217;anys de 1970 a 2000 s&#8217;ha fet servir per efectuar el control de la simulaci\u00f3, i a partir de l&#8217;any 2001 s&#8217;ha verificat any a any la projecci\u00f3 clim\u00e0tica amb les dades observacionals corresponents -un acumulat de vint anys-, que estan confirmant clarament la tend\u00e8ncia mitjana de l&#8217;augment de la temperatura de l&#8217;aire i de la disminuci\u00f3 de la precipitaci\u00f3. Aquests resultats es corresponen al projecte: Simulacions regionalitzades din\u00e0micament a 10 km de resoluci\u00f3 (ESCAT-2012).<\/p>\n<p>Resultats que han estat confirmats en el projecte: Projeccions regionalitzades estad\u00edsticament a 1 km de Resoluci\u00f3 (ESCAT-2020). Tots els escenaris presenten una tend\u00e8ncia estad\u00edsticament significativa per la temperatura mitjana anual entre +0,7 i +2,1 \u00baC en els propers 45 anys i un augment de la variabilitat interanual. Les projeccions per a la precipitaci\u00f3 no s\u00f3n tan robustes, per\u00f2 sembla haver-hi una tend\u00e8ncia a una disminuci\u00f3 general de la precipitaci\u00f3 mitjana anual, aquesta disminuci\u00f3 seria molt important a l\u2019estiu al conjunt del pa\u00eds, i considerable a la tardor per a la zona litoral i prelitoral.<\/p>\n<h4>Conseq\u00fc\u00e8ncies<\/h4>\n<p>Una zona especialment sensible a l&#8217;actual canvi clim\u00e0tic \u00e9s la zona mediterr\u00e0nia, i en conseq\u00fc\u00e8ncia a Catalunya, que ja suporta i haur\u00e0 de suportar canvis clim\u00e0tics severs. Els fen\u00f2mens associats al clima que abans tenien lloc amb una taxa de freq\u00fc\u00e8ncia baixa o limitada, s&#8217;estan convertint en esdeveniments freq\u00fcents o molt freq\u00fcents de major intensitat i amb una taxa de recurr\u00e8ncia cada vegada m\u00e9s gran. Aix\u00f2 afecta especialment a la zona mediterr\u00e0nia, el que agreuja els riscos. Els esdeveniments meteorol\u00f2gics seran cada vegada m\u00e9s abundants, m\u00e9s freq\u00fcents i m\u00e9s extrems. Catalunya, dins de el marc peninsular ib\u00e8ric i sud europeu, s&#8217;enfronta principalment als seg\u00fcents canvis:<\/p>\n<ul>\n<li>Un augment de les temperatures, amb un major nombre de nits tropicals (temperatura m\u00ednima nocturna &gt;20\u00baC)<\/li>\n<li>Un augment de situacions de sequeres<\/li>\n<li>Un augment de les onades de calor<\/li>\n<li>Un augment dels incendis<\/li>\n<li>Un major nombre i magnitud de les marejades, amb greus conseq\u00fc\u00e8ncies per inundaci\u00f3 a les zones costaneres, amb un augment dels processos d&#8217;erosi\u00f3 (recordem la borrasca Gl\u00f2ria a principis d&#8217;aquest any 2020 com a mostra)<\/li>\n<li>Pujada progressiva del nivell de la mar, tamb\u00e9 amb greus conseq\u00fc\u00e8ncies a les zones costaneres, i especialment a la zona de delta de l&#8217;Ebre<\/li>\n<li>Menys precipitaci\u00f3, m\u00e9s evapotranspiraci\u00f3, i en conseq\u00fc\u00e8ncia menys escorrentia, \u00e9s a dir menys disponibilitat d&#8217;aigua, amb un major estr\u00e8s h\u00eddric. El que tamb\u00e9 afectar\u00e0 la qualitat de les aig\u00fces i a l&#8217;estat ecol\u00f2gic i de funcionament dels ecosistemes<\/li>\n<li>El patr\u00f3 de precipitaci\u00f3 ser\u00e0 cada vegada m\u00e9s tempestu\u00f3s, amb major risc d&#8217;avingudes<\/li>\n<li>Menys neu al Pirineu, el que implica menys capacitat d&#8217;emmagatzematge d&#8217;aigua a les muntanyes, que es tradueix al seu torn en una menor disponibilitat d&#8217;aigua en el per\u00edode estival<\/li>\n<li>Aquesta reducci\u00f3 de la disponibilitat h\u00eddrica afectar\u00e0 a la producci\u00f3 d&#8217;energia hidroel\u00e8ctrica<\/li>\n<li>Augment de vulnerabilitat de les masses forestals<\/li>\n<li>Reducci\u00f3 del PIB, a causa d&#8217;aquest conjunt d&#8217;impactes clim\u00e0tics considerats, de l&#8217;ordre del 2-3% anual.\u00a0 Actualment a causa de la contaminaci\u00f3 de la qualitat de l&#8217;aire el Banc Mundial considera per a Espanya una p\u00e8rdua de l&#8217;ordre del 3,5% anual<\/li>\n<\/ul>\n<p><strong>Solucions<\/strong><\/p>\n<p>La soluci\u00f3 ha de venir de decisions pol\u00edtiques locals, regionals i globals i d&#8217;un canvi de l&#8217;actual model socioecon\u00f2mic-energ\u00e8tic. De l&#8217;esfor\u00e7 conjunt dels governs, les autoritats municipals, del sector privat, de la societat civil i altres organitzacions per tal de desenvolupar conjuntament i de forma accelerada solucions ambicioses en les seg\u00fcents \u00e0rees:<\/p>\n<ul>\n<li>Transici\u00f3 energ\u00e8tica global cap a energies renovables, afavorint l&#8217;autoconsum, que realitzi una reducci\u00f3 total de les emissions, la Uni\u00f3 Europea marca un objectiu de neutralitat en carboni per a l&#8217;any 2050, amb un objectiu previ per a l&#8217;any 2030<\/li>\n<li>Creaci\u00f3 d&#8217;infraestructures resilients<\/li>\n<li>Adaptaci\u00f3 de les ciutats a un model sostenible i resilient<\/li>\n<li>Establiment d&#8217;una agricultura sostenible<\/li>\n<li>Establir progressivament un sistema de transport de zero emissions, mitjan\u00e7ant la seva electrificaci\u00f3<\/li>\n<li>Plans d&#8217;adaptaci\u00f3 als impactes clim\u00e0tics, especialment del conjunt d&#8217;elements que conformen el nostre sistema d&#8217;infraestructures (sistemes de generaci\u00f3 el\u00e8ctrica, sistemes de comunicaci\u00f3 i transport, regadius, abastament d&#8217;aigua, de protecci\u00f3 i ordenaci\u00f3 urban\u00edstica, etc.)<\/li>\n<li>Converg\u00e8ncia d&#8217;un finan\u00e7ament p\u00fablic i privat per aconseguir una economia de zero emissions netes de gasos d&#8217;efecte hivernacle<\/li>\n<li>Fomentar la reforestaci\u00f3, amb l&#8217;objectiu d&#8217;augmentar la captaci\u00f3 del CO2 atmosf\u00e8ric<\/li>\n<li>Pla de seguiment del desenvolupament del canvi clim\u00e0tic i dels seus impactes<\/li>\n<\/ul>\n<h4>Conclusions<\/h4>\n<p>S&#8217;ha de ser conscient que \u00e9s impossible revertir la din\u00e0mica de l&#8217;actual canvi clim\u00e0tic, i efectivament s&#8217;est\u00e0 en una situaci\u00f3 d&#8217;emerg\u00e8ncia clim\u00e0tica. Catalunya ja est\u00e0 veient-se afectada de forma molt important, i ho estar\u00e0 m\u00e9s en un futur immediat. Catalunya es troba en una zona territorial molt vulnerable a l&#8217;actual canvi clim\u00e0tic. Aix\u00f2 implica que hem d&#8217;adoptar i aplicar, el m\u00e9s aviat possible, una pol\u00edtica que ha de ser priorit\u00e0riament tant de mitigaci\u00f3, \u00e9s a dir, de reducci\u00f3 de les emissions dels gasos d\u2019efecte hivernacle, com m\u00e9s aviat millor, com d&#8217;adaptaci\u00f3 per esmorteir i limitar al m\u00e0xim els seus efectes negatius.<\/p>\n<p>Barcelona, 22 de novembre del 2020<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Informe rem\u00e8s per Jos\u00e9 Mar\u00eda Baldasano, com a expert independent, a la Comissi\u00f3 d\u2019Emerg\u00e8ncia Clim\u00e0tica del Parlament de Catalunya<\/p>\n","protected":false},"author":12,"featured_media":83959,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[310],"tags":[],"class_list":["post-96599","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medi-ambient","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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