Bjørn Lomborg

PRAHA – Meteorologické podmínky panující během letošního léta poskytly po celém světě dostatek munice pro debatu o globálním oteplování. Sucha a vlny veder jsou předzvěstí naší budoucnosti, uhlíkové škrty jsou zapotřebí více než kdykoliv dříve, avšak smysluplná politika stále nebyla uzákoněna.

Na pozadí tohoto důvěrně známého bitevního pole se však stalo něco ohromujícího: emise oxidu uhličitého ve Spojených státech klesly na nejnižší úroveň za posledních 20 let. Podle odhadů získaných na základě dat Americké energetické informační agentury (EIA) za prvních pět měsíců roku 2012 se letošní očekávané emise CO2 oproti vrcholu v roce 2007 snížily o více než 800 milionů tun neboli o 14%.

Důvodem je dosud nevídaný přechod na zemní plyn, jehož spalováním se uvolňuje o 45% méně uhlíku na jednotku energie. USA kdysi vyráběly zhruba polovinu své elektrické energie z uhlí a zhruba 20% ze zemního plynu. V posledních pěti letech se tato čísla měnila, nejprve pomalu a nyní dramaticky: v dubnu letošního roku se podíl uhlí na celkové výrobě energie propadl na pouhých 32% a srovnal se se zemním plynem.

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