Formation of ozone

Ozone is formed in the atmosphere when ultra violet radiation from the sun strikes the stratosphere,splitting oxygen molecules(02) in to atomic oxygen (o).The atomic oxygen quickly combines with further oxygen molecules to form ozone.

At Ground Level,ozone is a health hazard and is a major constituent of photochemical smog.However,in the stratosphere we need ozone to absorb some of the potentially harmful ultra-violet(UV) radiation from the sun (at wavelength between 240 and 320 nm) which can cause skin cancer and damage vegetation.

Rising Sea Level

UN Climate scientists Predicted that The world’s sea level rise twice as high this century as previously predicted, The Intergovernmental Panel on Climate Change proposes a maximum sea level rise of 81cm (32in) this century. But in the journal Nature climate scientists, researchers say the true maximum could be about twice that: 163cm (64in). They looked at what happened more than 100,000 years ago - the last time Earth was this warm. The results join other Studies showing that current sea level projections may be very conservative. Sea level rise is a key effect of climate scientists. There are two major contributory effects: expansion of sea water as the oceans warm, and the melting of ice over land. In the latest study, researchers came up with their estimates by looking at the so-called interglacial period, some 124,000 to 119,000 years ago, when Earth’s climate was warmer than it is now due to a different configuration of the planet’s orbit around the Sun. That was the last time sea levels reached up to 6m (20ft) above where they are now, filled by the melting of ice sheets that covered Greenland and Antarctica.