How do we know if the planet is getting warmer?

The Earth has warmed more than twice as much as it has cooled since 1900, according to new analysis from a leading global climate research group.

That was the case even before the industrial revolution, said lead author Paul J. Bock, a climate scientist at the National Center for Atmospheric Research in Boulder, Colorado.

Bocks team looked at data from the U.S. National Oceanic and Atmospheric Administration, NASA’s Goddard Institute for Space Studies, the University of East Anglia in England, and the University at Buffalo.

It found that from 1900 to 2010, the planet has warmed by about 0.3 degrees Celsius.

The difference is smaller than the difference between what the planet will warm in the next century and what it has warmed since the Industrial Revolution, the scientists said in a statement.

The researchers looked at how much global warming has occurred over the past century in addition to the Earth’s past climate cycles, which include the Holocene, a period in the Earths history when the Earth was much warmer than it is now.

It’s possible that the warming we’ve seen in recent years has been the result of greenhouse gas emissions and other natural factors, said Kevin Trenberth, a researcher at the University College London and lead author of the study.

The research has been published in the journal Nature Climate Change.

A study earlier this year found that the average global temperature over the last few decades has been about 0 to 2 degrees Celsius hotter than it was in pre-industrial times.

The new paper also found that global temperatures are now warmer than at any time since the 19th century.