People usually ______ (throw) too much plastic into the ocean.
Throw
If it ______ (rain), plants ______ (grow) faster.
Rains / Grow
Factories ______ (release) smoke that ______ (cause) air pollution.
Release / Causes
The Earth ______ (need) clean air and water to stay healthy.
Needs
Trees ______ (produce) oxygen that humans need to breathe.
Produce
The temperature ______ (rise) when people ______ (burn) fossil fuels.
Rises / Burn