En términos económicos, Kyoto sólo genera alrededor de 30 centavos de dólar de beneficios por cada dólar gastado.
And deeper emissions cuts like those proposed by the European Union – 20% below 1990 levels within 12 years – would reduce global temperatures by only one-sixtieth of one degree Celsius (one-thirtieth of one degree Fahrenheit) by 2100, at a cost of $10 trillion.