why do we need to reduce global warming

It is not enough to act. We have to act now. Delayed efforts to mitigate either carbon dioxide or short-lived climate pollutant emissions will have negative, and potentially irreversible, consequences for global warming, rising sea levels, agricultural yields, and public health. Due to their relatively short lifetime in the atmosphere, ranging from a few days to a few decades, short-lived climate pollutants respond very quickly to reduction efforts.

If fast and widespread action is taken to reduce these pollutants, it is likely that we could cut methane emissions by 25% and black carbon by 75%, and eliminate high-global warming potential hydrofluorocarbons altogether in the next 25 years.

Avoid an estimated 2. 4 million premature deaths
Prevent as much as 52 million tonnes Slow the increase in near-term global warming by as much as 0. 6 C by 2050 Prevent climate tipping points that can exacerbate long-term climate impacts and make adapting to climate change harder, especially for the poor and most vulnerable A global effort to reduce both near- and long-term climate change, starting now, can rapidly bend the global warming curve and keep warming below 2 C. Researchers Stephen Pacala and Robert Socolow have suggested one approach that they call stabilization wedges.

This means reducing GHG emissions from a variety of sources with technologies available in the next few decades, rather than relying on an enormous change in a single area.

They suggest seven wedges that could each reduce emissions. All of them together could hold emissions at approximately current levels for the next 50 years, putting us on a potential path to stabilize around 500 ppm.

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