The Washington Post explains our situation in the simplest, and starkest, of terms.

The world will have to end its growth of carbon emissions within seven years and become mostly free of carbon-emitting technologies in about four decades to avoid killing as many as a quarter of the planet’s species from global warming, according to top United Nations’ scientists.

To avoid heating the globe by the minimum possible, an average of 3.6 degrees Fahrenheit, the world’s spiraling growth in greenhouse gas emissions must end no later than 2015, the report said, and must start to drop quickly after that peak. By 2050, carbon dioxide and other atmospheric polluting gases must be reduced by 50 to 85 percent, according to the estimates.
That would require a drastic reworking of industrial processes, transportation, agricultural practices and even the buildings people live in, according to the report’s calculations.

“We may have already overshot that target,” said David Karoly, one member of the core team that wrote the report. Current emissions already are nearing the limit required in 2015 to limit the warming to 2 degrees Celsius, he said in an interview from Valencia.

Even at that threshold, the seas will continue to swell for centuries from thermal expansion and meltwater from ice caps and glaciers; the oceans will turn more acidic; most coral reefs will become lifeless expanses; floods and storms will increase; and millions of people will be short of the water they need, the report said.

But if the world misses that target and does not stabilize carbon dioxide emissions until 2030, for example, the planet’s temperature will increase by as much as 6.3 degrees Fahrenheit above 2000 temperatures, the report said. That level of warming would result in widespread extinctions of species, a slowing of the global currents, decreased food production, loss of 30 percent of global wetlands, flooding for millions of people and higher deaths from heat waves.

So what are you doing, right at this minute, to curb your greenhouse gas emissions?