Global Warming - NASA Earth Observatory
Global warming is happening now, and scientists are confident that greenhouse gases are responsible. To understand what this means for humanity, it is necessary to understand what global warming is, how scientists know it's happening, and how they predict future climate.
World of Change: Global Temperatures - NASA Earth Observatory
The average global temperature has increased by a little more than 1° Celsius (2° Fahrenheit) since 1880. Two-thirds of the warming has occurred since 1975.
2021 Continued Earth’s Warming Trend - NASA Earth Observatory
Jan 13, 2022 · The planet is already seeing the effects of global warming: Arctic sea ice is declining, sea levels are rising, and wildfires are becoming more severe. Understanding how the planet is changing—and how rapidly those changes are occurring—is crucial for preparing humanity to adapt to a warmer future.
If Earth has warmed and cooled throughout history, what makes ...
May 4, 2010 · If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now? The first piece of evidence that the warming over the past few decades isn’t part of a natural cycle is how fast the change is happening.
Global Warming - NASA Earth Observatory
To understand what this means for humanity, it is necessary to understand what global warming is, how scientists know it's happening, and how they predict future climate. Global warming is happening now, and scientists are confident that greenhouse gases are responsible.
Climate Q&A - Are the ozone hole and global warming related?
Global warming is the rise in average global surface temperature caused primarily by the build-up of human-produced greenhouses gases, mostly carbon dioxide and methane, which trap heat in the lower levels of the atmosphere. There are some connections between the two phenomena.
Five Factors to Explain the Record Heat in 2023 - NASA Earth …
Jan 12, 2024 · Water vapor, a greenhouse gas, can produce a warming effect on the atmosphere, so scientists investigated the impact of the eruption on the global temperature. Sulfate aerosols from eruptions, on the other hand, have sometimes led to some global cooling events.
Svante Arrhenius - NASA Earth Observatory
Svante Arrhenius was the first person to investigate the effect that doubling atmospheric carbon dioxide would have on global climate.
Earth’s Temperature Tracker - NASA Earth Observatory
The first reliable global measurements of temperature from NASA, published by Hansen and his colleagues in 1981, showed a modest warming from 1880 to 1980, with only a slight dip in temperatures from 1940 to 1970.
Global Warming - NASA Earth Observatory
Global warming is happening now, and scientists are confident that greenhouse gases are responsible. To understand what this means for humanity, it is necessary to understand what global warming is, how scientists know it's happening, and how they predict future climate.