SUA și China însumează 38% din emisiile de gaz cu efect de seră la nivel mondial, astfel că decizia lor este o etapă majoră în procesul de punere în aplicare a acordului adoptat pe 12 decembrie, la finalul COP21, a 21-a Conferinţă a părţilor la Convenţia cadru a ONU privind modificările climatice.
Acordul de la Paris stabileşte ca obiectiv oprirea nivelului creşterii temperaturii medii a planetei „sub 2°C” faţă de nivelul din perioada preindustrială şi eforturi în vederea limitării acestei creşteri la 1,5°C.
Documentul pune bazele unui control al emisiilor de gaze cu efect de seră care se află la originea perturbărilor climei prin stabilirea cadrului unor angajamente politice, economice şi financiare şi pledează în favoarea unei tranziţii energetice rapide către surse mai curate, ca energia solară şi eoliană.
Pentru a intra în vigoare, acordul este necesar să fie ratificat de cel puţin 55 de ţări, care să însumeze 55% din emisiile de gaz de seră.
Până când China și SUA au anunțat că ratifică acordul, alte 23 de ţări, care reprezintă doar aproximativ 2% din totalul emisiilor de gaze cu efect de seră, au luat aceeași decizie.
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