The biggest environmental challenges are :
1. Global warming
3. Ozone layer depletion
I would say that the preservation and adequate distribution of fresh water would be the first priority.
Closely connected to this, I would mention the care and preservation of the Antartic continent, the only possible backup for fresh water in the not so far future.
As a third point, I would include better use of non renewable energy sources, as the misuse of these is basically what causes global warming, pollution and ozone layer depletion
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