Kartik Bhardwaj is teaching live on Unacademy Plus
Greenhouse Gases and their Contribution Greenhouse gases (GHGs) warm the Earth by absorbing energy and slowing the rate at which the energy escapes to space; they act like a blanket insulating the Eartlh Parameter for GHGs i) Abundance water vapour carbon dioxide Methane Dinitrogen oxide Ozone ii) Atmosphere time Water vapour days to week Ozone- days to week Methane- 12 to 14 year CFCs-45 to 50 yr Carbon dioxide-100 to 300 yr . . HFC 260 to 270 yr SF6-3200 YR (MAN MADE GAS)
ii) Global worming potential it is a measure of how much energy the emissions of 1 ton of a gas will absorb over a given period of time, relative to the emissions of 1 ton of carbon dioxide (CO2) CH4-21 N20-320 HFC-23 11700 CFCs-5350 SF6-23000 Chlorofluorocarbons (CFCs) play a role in both global warming and ozone-hole formation In the troposphere, they act as greenhouse gases. They absorb infra-red radiation coming from the surface of the Earth and, by trapping this . heat close to the Earth they contribute to global warming. Sun into chlorine radicals and these have the ability destroy ozone. FEEDBACK EFFECTS In the stratosphere they are broken down by high intensity ultra-violet radiation from the .POSATIVE: magnified the impact of the previous event ex- water vapour, ice melting, cloud formation NEGATIVE: reduce the impact of the previous event ex-cloud formation Geo-Engineering t is large-scale intervention in the Earth's climatic system with the aim of limiting climate change. Theoretically, there are two major types of interventions-Carbon Sequestration and solar radiation management.