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Computare
The Greenhouse Effect is Real
Incoming energy
Reflected energy
Outgoing energy
Energy trapped
by greenhouse gases
(GHGs)
Major Greenhouse Gases - water vapour, carbon dioxide, methane, nitrous oxide, ozone
Enhanced Greenhouse effect - more CO2, CH4, N2O + halocarbons
Aerosols - not a GHG - microscopic particles, natural sources, sulphur dioxide, burning
Dr Lemmen explained that gases accumulating in the atmosphere are trapping energy on earth leading to increases in temperature. Much of this is due to natural processes. Water vapor in the atmosphere is responsible for most  of this heating and is largely responsible for making earth warm enough to support life as we know it.
Human activity is contributing to a buildup of other gases, particularly carbon dioxide, and this is the reason for our concern we may causing changes to climate.