Global Warming Documentary by National Geographic

For 2.5 million years, the Earth’s climate has fluctuated cycling from ice ages to warmer periods but in the last century the planet’s temperature has risen
unusually past about 1.2 to 1.4 degrees Fahrenheit scientists believe its human activity that’s driving the temperatures up a process known as global warming. Ever since the industrial revolution began factories power plants and eventually cars burn fossil fuels such as oil and pour releasing huge amounts of carbon dioxide and other gases into the atmosphere, these greenhouse gases trap heat near the year through a naturally occurring process called the greenhouse effect the greenhouse effect begins with the Sun and the energy radiates to the your the earth and the atmosphere absorb some of his energy while rest is radiated back into
space. Naturally-occurring gases in the atmosphere trap some of this energy and reflected back warming the year, well scientists now believe that the greenhouse effect has been intensified by the extra greenhouse gases that humans have released evidence for global warming includes a recent string and nearly one hears scientists report that 1998 was the warmest year in measured history with 2005 coming in second, meanwhile readings taken from high school to show that the greenhouse gases carbon dioxide and methane have hit their highest levels in the past four hundred and twenty thousand years.

Arctic sea ice is also shrinking according to nasa studies the extended Arctic sea ice has declined about 10 percent in the last thirty years, as long as industrialized nations consume energy and developing countries increase their fossil fuel consumption the concentration of greenhouse gases in the atmosphere will continue to rise. researchers predict that temperatures will increase about two to 10 degrees Fahrenheit by the end of the century what’s less certain is what rising temperatures mean for the planet, some climate models predict subtle changes others forecast rising sea levels which could flood coastal areas around the
world. Weather patterns could change making hurricanes more frequent severe drought could become more common in warm areas and species unable to adapt to the changing conditions would face extinction, although much remains to be learned about global warming many organizations advocate cutting greenhouse gas emissions to reduce the impact of global warming. consumers can help by saving energy around the house switching to compact fluorescent light bulbs and driving fewer miles in the car screen the simple changes may help keep your cooler in the future.