II.1 if I were you I would use energy efficient light bulbs

2 he came up with a great idea for our environmental project

3 beacuse of being absent from the meeting she didn't know the resolution

4 if I had enough free time I would take part in the volunteer program

5 if we didn't reduce our plastic waste we would threaten our own existence

6 since there was a hurricane last night I was without electric power

7 toxic waste products were dumped into the rivers o landfill sites

8 unless nation acts air pollution deaths will double by 2050

9 due to the world's temperature rise the arctice keeps losing its ice

10 it I didn't live by the sea I wouldn't be really worried about global warning