NASA’s Earth Minute: Usual Suspects ep4

Before the Industrial Revolution, Earth’s climate changed due to natural events such as volcanic activity and solar energy variations. These natural events still contribute to climate change today, but their impact is very small compared to the growing levels of greenhouse gases added to the atmosphere by humans burning fossil fuels. NASA’s ongoing Earth science missions, research and computer models help us better understand the long-term global changes occurring today through both natural and manmade causes.