LiveScience Topic:
Global Warming: News, Facts, Causes & Effects

Global warming is the term used to describe a gradual increase in the average temperature of the Earth's atmosphere and its oceans, a change that is believed to be permanently changing the Earth’s climate. There is great debate among many people, and sometimes in the news, on whether global warming is real (some call it a hoax). But climate scientists looking at the data and facts agree the planet is warming. While many view the effects of global warming to be more substantial and more rapidly occurring than others do, the scientific consensus on climatic changes related to global warming is that the average temperature of the Earth has risen between 0.4 and 0.8 °C over the past 100 years. The increased volumes of carbon dioxide and other greenhouse gases released by the burning of fossil fuels, land clearing, agriculture, and other human activities, are believed to be the primary sources of the global warming that has occurred over the past 50 years. Scientists from the Intergovernmental Panel on Climate carrying out global warming research have recently predicted that average global temperatures could increase between 1.4 and 5.8 °C by the year 2100. Changes resulting from global warming may include rising sea levels due to the melting of the polar ice caps, as well as an increase in occurrence and severity of storms and other severe weather events.

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A melt pond in the Arctic ice.
The dazzling blue melt ponds that dot the Arctic sea ice speed up melting.
Barack Obama in White House
Scientists and advocacy groups praise the environmental focus.
celebrities
Polarization in Congress may stymie any overarching plan to combat global warming.
great smoky mountains, black bears, cute animal
The International Space Station shooting across the sky, climate change threatening a unique Hawaiian plant and record cold chilling the southwest all made our top picks this week. Check these out.
Haleakalā silversword
Once a conservation success story, the rare Haleakalā silversword plant is dying off as weather patterns shift on Maui.
As climate change has warmed average spring temperatures at two historic American sites, the date that plants first flower has crept earlier
This map represents global temperature anomalies averaged from 2008 through 2012.
The nine warmest years since 1880 have occurred since 2000, revealing a trend of global warming.
An image of the weather above the West Coast, taken by the NOAA GOES-15 satellite. Notice the lack of moisture over the Southwest, corresponding to cold, dry air.
A blocked atmosphere pattern has Arctic air extending all the way to Mexico.
doomsday clock
The hands of the infamous "Doomsday Clock" will stay firmly in place for the year 2013.
An undated photo of a rare snowfall in Jerusalem.
Don't let the chilly weather fool you; Earth is getting hotter.
view of Earth and cloud cover
The future looks bleak for Americans, who can expect their livelihoods changed by global warming.
killer-whales
As the planet warms, will we see more trapped sea mammals?
The coldest winter in nearly 30 years chills China.
Tasmanian wildfires. Image taken by NASA's Terra satellite on Jan. 7, 2013.
The heat is expected to get worse before it's over.
The blanket of snow that covers Arctic regions for most of the year has been shrinking at an increasing pace over the past decade, researchers say.
San Francisco Bay from space
Marshes in San Francisco Bay will become mud flats as sea-level rise drowns plants, a new study finds.
suomi npp photo earth blue marble east
The continental U.S. was 3.2 degrees F above the 20th-century average.
lava eruption
While scientists knew that volcanism caused climate change, new research suggests it goes the other way too
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