Lower prices can make more people eat vegetarian

More meat eaters would choose a vegetarian burger if it was cheaper than a meat burger. But it takes a large price difference—even if the price was reduced by 30%, only a third of those who normally choose meat burgers ...

Study: Climate change a major factor in South Africa floods

The fatal floods that wreaked havoc in South Africa in mid-April this year have been attributed to human-caused climate change, a rapid analysis published Friday by a team of leading international scientists said.

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Greenhouse gas

Greenhouse gases are gases in an atmosphere that absorb and emit radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. Common greenhouse gases in the Earth's atmosphere include water vapor, carbon dioxide, methane, nitrous oxide, and ozone. In our solar system, the atmospheres of Venus, Mars and Titan also contain gases that cause greenhouse effects. Greenhouse gases greatly affect the temperature of the Earth; without them, Earth's surface would be on average about 33°C (59°F) colder than at present.

Human activities since the start of the industrial era around 1750 have increased the levels of greenhouse gases in the atmosphere. The 2007 assessment report compiled by the IPCC observed that "changes in atmospheric concentrations of greenhouse gases and aerosols, land cover and solar radiation alter the energy balance of the climate system", and concluded that "increases in anthropogenic greenhouse gas concentrations is very likely to have caused most of the increases in global average temperatures since the mid-20th century".

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