Question

объединить 2 предложения в 1 и внести необходимые изменения
people leave litter in the forest   -  it hurts the animals .
factories and cars pollute the air  -  it causes  climate change

Answer 1

People leave litter in the forest hurting the animals.
Factories and cars pollute the air causing climate change.

Answer 2

It hurts the animals that people leave litter in the forest
The climate change causes because of factories and cars pollute the air