Which of the following is not a significant threat to the world's rainforests?

a.

logging

b.

agriculture

c.

grazing

d.

shipping

The option which is not a significant threat to the word's rainforests is D. shipping. Logging refers to cutting down the trees, which can obviously have negative consequences when it comes to forests. Agriculture also refers to deforestation in order to create fields for the crops. Grazing animals eat grass, which doesn't bode well for the forest. So, the only option that doesn't really have anything to do with rainforests is shipping.

Shipping would be the answer