Is it too late to stop climate change?

全球变暖,由于温室气体等carbon dioxide, is as real as a Texas-sized drought. While the planet’s temperature has increased just 1 degree Fahrenheit (.55 degrees Celsius) during the past century, Earth’s coldest regions have warmed significantly more. As a result, many plant and animal species are on the verge of extinction. Blizzards, floods and hurricanes have become more devastating. Ice is melting, oceans are rising, glaciers are tumbling and the weather has fluctuated wildly from balmy winters to brisk summers.

As Earth’s CO2 levels increase, so will the temperature, some 10 degrees Fahrenheit (5.5 degrees Celsius) by the end of the century. In fact, global temperatures are rising faster than at any other time in the past 1,000 years. Global warming has put many places, including Tuvalu, on the front lines in the war against climate change. While some scientists believe we’re close to the point of no return, others say it's not too late stop global warming. Cutting our current C02 emissions in half within the next 50 years might save the planet.

But reducing those emissions is easier said than done.Climate changehas become mired in politics as many policy makers don't want to admit that humans are to blame for Earth’s escalating temperature. They say warming is part of Earth’s natural cycle. Nevertheless, most reputable scientists agree that humans are responsible. For centuries we have been burning oil, coal and otherfossil fuelsto power our lives, and at the same time spewing tons carbon dioxide and other heat-trapping gasses into the atmosphere. Those gases act like an invisible blanket, trapping the sun’s heat close to Earth’s surface.

Yet all is not lost. In recent years, many countries have taken significant steps to reduce their carbon footprint. In addition, various industries are experimenting with alternative, cleaner-burning fuels, such as wind and solar, to power their factories. Car companies are now building hydrogen- and electric-powered cars to replace gasoline as the fuel of choice.

Scientists are also studying new ways to cool the planet, including increasing Earth’s albedo, or its ability to reflect sunlight back into space. Scientists say increasing the planet’s albedo by 1 percent -- by painting roads and roof tops white -- might be enough to halt global warming. Some scientists have even gone as far as proposing to launch thousands ofmirrorsinto Earth orbit to reflect the sun’s rays back into space. In addition one Nobel Prize-winning scientist, Paul Crtuzen, suggests that tiny particles called sulfates can act as a cosmic sunscreen by blocking the sun’s rays from reaching Earth. The key is to pump the atmosphere with tons of these Lilliputian particles.

While some of these ideas might sound off the charts, the underlying principle of stopping global warming is not. Whether it’s turning off a light when leaving a room or building windmills to replace coal-fired power plants, stopping global warming could be a matter of survival.