, in the form of ultra-violet radiation
, passes through the ozone layer
on its way to the planet's surface. When it hits the ground it is converted to infra-red
radiation and reflected back into the atmosphere
, and from there into space
Greenhouse gases trap the infra-red radiation and reflect it back towards earth, heating the planet up. Glass performs a similar function in a greenhouse.
Greenhouse gases include :
The concentration of most of these gases in the atmosphere has increased by 25% since industrialisation began.