There is no effect.
Landfills need more space, so they take all they want.
Landfills burn the trash, which increases the amount of greenhouse gases in the air.
Both b and c.
It stays there and smells bad.
When it rains, it pollutes bodies of water.
Both a and c.
Use solar energy for electricity.
Use as little wood as possible.
Recycle paper, aluminum cans, glass bottles, etc.
Start an electricity company (that uses coal).
Become a woodcutter.
Buy or build a farm after clearing forests.
Go to school/work using public transport.
Carpool to school/work (go to school/work with a friend).
Throw away everything that you use in the trash.