The world is on track to add 700 million new ACs by 2030, and 1.6 billion by 2050, largely in hot, developing countries like India and Indonesia ... Air conditioners use refrigerants, and some of the most common types — hydrofluorocarbons, or HFCs — are powerful greenhouse gases, with thousands of times the warming potential of carbon dioxide. If HFC use continues to grow at its current pace, these chemicals could make up as much as 19 percent of emissions by 2050.

known as mires or bogs, peatlands only cover about 3 percent of the planet’s total land surface, but they contain up to a third of all of the carbon locked in Earth's soils. They're formed by an accumulation of partially decayed vegetation or organic matter in a wetland environment ... carbon has been accumulating in the Congo Basin's peat for nearly 11,000 years ... Peatlands are only a resource in the fight against climate change when left intact

In effect, what the researchers in both Iceland and Washington State were accomplishing was a high speed version of the geological process known as “weathering,” in which carbon dioxide very slowly becomes locked away in rock layers ... the new research appears to be another step along the way to a world in which, even if our industrial processes necessarily produce lots of carbon dioxide, we have other options than to just let it spill into the atmosphere.

The tech involves a new combination of copper and carbon arranged into nanospikes on a silicon surface ... This process has several advantages when compared to other methods of converting CO2 into fuel. The reaction uses common materials like copper and carbon, and it converts the CO2 into ethanol, which is already widely used as a fuel. Perhaps most importantly, it works at room temperature, which means that it can be started and stopped easily and with little energy cost.

The solar cells...function like a plant’s leaves. Except instead of converting carbon dioxide into sugar, the artificial leaf converts the gaseous compound into synthesis gas — a mixture of hydrogen and carbon monoxide. Synthesis gas, or syngas, could be burned for fuel, or converted into diesel or other hydrocarbon fuels ... The “leaf” is one of a growing number of inventions that mimic photosynthesis to remove excess carbon from the atmosphere

Passing the 400 ppm milestone in is a symbolic but nonetheless important reminder that human activities continue to reshape our planet in profound ways. We’ve seen sea levels rise about a foot in the past 120 years and temperatures go up about 1.8°F (1°C) globally. Arctic sea ice has dwindled 13.4 percent per decade since the 1970s, extreme heat has become more common and oceans are headed for their most acidic levels in millions of years.

Although emissions from air travel contribute only two percent of global greenhouse gas emissions, they contribute about 12 percent of carbon dioxide (CO2) emissions from all transportation sources ... The growing popularity of air travel is expected to drive those numbers up. Aviation and shipping are expected to contribute 40 percent of all carbon dioxide emissions by 2050

extracting the troublesome greenhouse gas from power plant emissions is usually way too expensive to be worthwhile. Plus there’s the fear that the stuff might leak from its tomb. But a plant in Iceland might have found a solution. By pumping the stuff into volcanic basalt, the CarbFix Project has converted 95 percent of the CO2 emissions from a geothermal plant into solid carbonate minerals.

While the relationship between road travel and carbon emissions is part of regular discourse, the role of air travel seems much less so. Yet for those of us who rely on feet, bicycles, public transportation or hybrid technology to get around in our daily lives, but enjoy a handful of plane trips per year, flying accounts for the vast majority of our carbon footprints ... The amount of fuel that a plane burns is astronomical ... Air travel is very carbon-inefficient

when the global atmospheric CO2 level reaches 930 gigatons, Boston will be due for about 9 feet of sea level rise. That’s enough water to cover 25 percent of the city during high tide. In the extreme cuts scenario, atmospheric CO2 never reaches that level. Under business as usual fossil emissions however, a quarter of Boston is locked into a future under water by 2045.