31.   The human influence stems mostly from emissions of waste industrial gases like carbon dioxide, which trap heat in the atmosphere, and sulfate aerosols from industrial smokestacks.

32.   The MIT mirrors could also be useful in improving thermophotovoltaic cells, devices that trap waste heat and convert it to energy.

33.   The plastic will trap solar heat underneath and make the stump a cozy home for the organisms that will feed on it.

34.   The treaty, called the Kyoto Protocol, requires industrialized countries to cut releases of carbon dioxide and other greenhouse gases that trap heat in the atmosphere.

35.   The warming is at least partly caused by the burning of fossil fuels, which release carbon dioxide and other gases that trap solar heat, they say.

36.   Their stated aim is to curb global climate changes by setting new worldwide targets for reduction of gases that trap heat in the atmosphere.

37.   Then the thickening atmosphere will trap more heat, releasing still more gas.

38.   These gases trap heat.

39.   Those gases trap heat, and although there is ongoing dispute about how that in turn affects the climate, there is no doubt that global temperatures are rising.

40.   Tropical forests absorb large amounts of carbon dioxide, one of the gases that traps solar heat and is thought to increase global warning.