1. Amazon rainforest is important because it absorbs carbon dioxide, which prevents the greenhouse effect and provides a habitat for huge amount of unique plants and animal species. It's threatened because there are plans of cutting the rainforest to make place for grazing cattle - a largely profittable source of leather. - paragraphs B and C

2. Italy. - paragraph A

3. They can trace the source of beef and leather and boycott the producers who are cutting down rainforests. - paragraph E

4. Because they are businessmen and care only about profits. - paragraph D