Question: sam how many polo bears lost there lives because of the ozone layer

Sam Lawrence answered on 12 Nov 2019:

So the ozone layer is an gaseous boundary in the Earth’s atmosphere. It is necessary for life to flourish. This is because it protects us from harmful ultra-violet (high energy) light rays. Such light rays burn our skin and can cause skin cancer. The ozone layer is between 9 and 20 miles above the ground.
Certain gases, such as chlorofluorocarbons, CFCs, can react with the ozone layer which reduces the amount of ozone (a type of oxygen molecule) in the air. This then reduces the amount of protection we have against harmful radiation from space, which will then warm our planet. CFCs used to be used to make refrigerators before a number of countries banned its use for this reason.
More recently, global warming is caused by “greenhouse gases” being released into the Earth’s atmosphere. These gases act almost as a winter coat for the Earth, however the Earth is too hot and cannot cool down! Since the Earth finds it hard to dissipate its heat, the ice bergs melt and polar bears lose their habitat!
The surface ice of Earth has decreased by about 40% between 1979 and 2010, that’s an area larger than Alaska and California combined. It’s very hard to estimate how many polar bears have died as a consequence of this, however it is fair to say that global warming is threatening to polar bears. Not only is it melting their habitat with the potential of them drowning, they feed on seals which they catch using holes in the ice caps. There are less holes and less opportunity for them to catch their food which could decrease their population. They also have to travel further to hunt their food.