therefore human emissions upset the natural balance, rising co2 to levels not seen in at least 800,000 years.
therefore human emissions upset the natural balance, rising co2 to levels not seen in at least 800,000 years.
greenhouse gas:244
the sharp acceleration in co 2 emissions since 2000 to more than a 3% increase per year (more than 2 ppm per year) from 1.1% per year during the 1990s is attributable to the lapse of formerly declining trends in carbon intensity of both developing and developed nations.