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This means that for shorter time periods—tens to a hundred thousand years—the temperature of Earth can vary.

And, in fact, Earth swings between ice ages and warmer interglacial periods on these time scales.

Fast-moving winds of particles fly off from the neutron star, energising the dust and gas around it. Seward et al.; VLA/NRAO/AUI/NSF; Chandra/CXC; Spitzer/JPL-Caltech; XMM-Newton/ESA; and Hubble/STSc I 27.8 MB Note: Crediting this image with the full credit line, in a visible way is MANDATORY, if you want to use it without paying a fee.

Greenhouse gases (GHGs) can be emitted through land clearance and the production and consumption of food, fuels, manufactured goods, materials, wood, roads, buildings, transportation and other services.

For simplicity of reporting, it is often expressed in terms of the amount of carbon dioxide, or its equivalent of other GHGs, emitted. fuel burned to produce goods far away from the final consumer.

Earth has undergone such a change over the last 50 million years, from the extremely warm climates of the Cretaceous (roughly 145 to 65 million years ago) to the glacial climates of the Pleistocene (roughly 1.8 million to 11,500 years ago).

This captivating new image shows the Crab Nebula in bright neon colours.