Fact 1: Ozone depletion results in higher levels of UV radiation reaching Earth.

Fact 2: Birds live on Earth, trees live on Earth.

Given the two facts above, answer the question "what results in higher levels of uv radiation reaching the place birds and trees live?" with the following options: 
- emissions
 - earthquakes
 - oxidation reaction
 - ozone depletion
 - global warming
 - important habitats
 - fairies
 - the ozone layer strengthening


 

    ozone depletion     