Group 1
1) average surface temperature
2) fossil fuels
3) greenhouse gases
4) cause global warming
5) add oxygen
6) animal species
7) climate change
8) polar ice
9) develop alternatives
10) renewable energy
11) nuclear energy
Group 2
1) to use everything
2) to continue
3) to delay
4) to think, get an idea or find sth
5) to take care of sth / sb
6) to stop using or doing sth
7) to finish, shut, cease an activity
8) to stop sleeping, awaken
9) to saw, chop
10) to exhaust, waste, dry up
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