Sentences with phrase «emissions from human activities at»

The study found that emissions from human activities at least doubled the risk of such an event.

Not exact matches

And achieving any stabilization target — whether 2 degrees C of warming or 450 ppm or 1,000 gigatons of carbon added to the atmosphere by human activity — will require at least an 80 percent cut in emissions from peak levels by the end of this century and, ultimately, zero emissions over the long term.

Global emissions of these non-methane hydrocarbons from vegetation and human activities are estimated at around 1.3 billion tonnes per year.

In one, emissions of nitrogen oxides and volatile organic compounds from human activities would continue at current levels through 2050.

At a time when greenhouse gas emissions from human activities are at historically high levels and glaciers are melting, Purple poses the question of human responsibilitAt a time when greenhouse gas emissions from human activities are at historically high levels and glaciers are melting, Purple poses the question of human responsibilitat historically high levels and glaciers are melting, Purple poses the question of human responsibility.

This concern, discussed at a meeting in Kyoto in 1973, helped inspire Mario Molina and Sherwood Rowland look into other chemical emissions from human activities.

Human activity — particularly the production of greenhouse gasses from fossil fuel emissions — is reshaping our planet, effecting rapid environmental change at a rate never seen before.

According to a new study published last week in Nature Geoscience, at current emission rates the trillionth ton of CO2 from human activity would be thrown into the atmosphere in about 30 years.

While the Kyoto Protocol had already been set into place as the primary solution to climate change, the historian of science Stuart Weart marks the point at the year 2001 where climate scientists had actually reached a consensus that human activity was warming the planet via GHG emissions and land - use changes, the former largely from fossil fuel use.

Perhaps the most important issue in all this is, as the Royal Society pointed out in their assessment of geoengineering, the first and foremost thing we have to do to stop climate change is radically limit greenhouse gas emissions resulting from human activity — stopping burning fossil fuels and stopping deforestation are at the top of list for how to do that.

In terms of greenhouse agents, the main conclusions from the WGI FAR Policymakers Summary are still valid today: (1) «emissions resulting from human activities are substantially increasing the atmospheric concentrations of the greenhouse gases: CO2, CH4, CFCs, N2O»; (2) «some gases are potentially more effective (at greenhouse warming)»; (3) feedbacks between the carbon cycle, ecosystems and atmospheric greenhouse gases in a warmer world will affect CO2 abundances; and (4) GWPs provide a metric for comparing the climatic impact of different greenhouse gases, one that integrates both the radiative influence and biogeochemical cycles.

These and other mercury emissions from human activities (past and present) account for at least 50 % and perhaps as much as 75 % of current, annual, global mercury emissions from all sources (including natural sources), but a large, unknown portion of those mercury emissions is due to past rather than current human activities, according to EPA estimates.