RT null T1 The Greenhouse Gases: UNEP/GEMS Environment Library No. 1 A1 United Nations Environment Programme, K1 greenhouse gas K1 methane K1 climate change K1 temperature K1 global warming K1 heat K1 Ozone YR 1987 FD 1987 LK https://wedocs.unep.org/handle/20.500.11822/29132 UL https://wedocs.unep.org/handle/20.500.11822/29132 NO The Earth's climate, over the millennia of its existence, has been shaped by the cosmic forces of nature—by the cooling of the Earth's core, variations in the intensity of the Sun, changes in the tilt of our planet. These were accompanied by remarkable alterations in the life forms our planet supported. DS UN Environment Document Repository RD Sep 18, 2026