1.
The burning of wood pellets is classed as
2.
The introduction of harmful materials into the environment
3.
The purposeful clearing of forested land
4.
Long term shifts in temperatures and weather patterns
5.
The reusing of old materials
6.
The place we put waste that can not be recycled
8.
The industry of building
10.
Is harmful to the environment
11.
Defective or not in use
13.
Renewable or non renewable
14.
A Hydrocarbon found in the ground
15.
The conversion of sunlight into energy
16.
Something that is derived from natural resources
17.
The release of greenhouse gases
19.
its what we stand on and is constantly changing
20.
a threat from global warming
