Sentences with phrase «holding atmospheric levels»

Nations collectively to begin to reduce sharply global atmospheric emissions of greenhouse gases and absorbing aerosols, with the goal of urgently halting their accumulation in the atmosphere and holding atmospheric levels at their lowest practicable value;

Not exact matches

«Low level of oxygen in Earth's middle ages delayed evolution for two billion years: A low level of atmospheric oxygen in Earth's middle ages held back evolution for 2 billion years, raising fresh questions about the origins of life on this planet.»

A low level of atmospheric oxygen in Earth's middle ages held back evolution for 2 billion years, raising fresh questions about the origins of life on this planet.

And while the cut would stabilize atmospheric carbon dioxide levels, it holds them at about 450 parts - per - million, according to the study.

Production values aren't sky - high, but there are atmospheric moments, particularly when it goes dark and you're given a flashlight (I just wish it could be held it in both orientations), and levels have been designed intelligently to play to the strengths of VR.

It considers a scenario where atmospheric levels of GHG are held at the levels of the year 2000.

The same holds for human CO2 releases: an initial increase in atmospheric CO2 levels will lead to increased uptake by the oceans and biosphere, but a part of the increase will remain in the atmosphere, as long as CO2 is constantly added.

If you are silly enough to contemplate a 2 ˚C rise, then just to have a 66 per cent chance of limiting warming at that point, atmospheric carbon needs to be held to 400ppm CO2e and that requires a global reduction in emissions of 80 per cent by 2050 (on 1990 levels) and negative emissions after 2070.

This fact explains why all future scenarios holding atmospheric CO2 constant at some specified level need to drive emissions gradually to zero.

However, to keep temperature rise limited to 1.5 C to 2C we need global atmospheric concentrations to be held well below 550ppm, which obviously requires substantially deeper and more costly levels of mitigation.

Increasing atmospheric carbon dioxide levels and associated global warming are often in the news — for example, coverage of an international environment summit (like that held in Johannesburg in 2002) or of local initiatives to cut carbon dioxide emissions (like «Walk to School Week»), or energy - saving initiatives in school.

Scientists examined the chemistry of brown carbon and found that increased nitrogen oxide levels result in particles that hold significantly more heat and cause the atmospheric mix to turn a familiar yellowish brown.