cause and effect of deforestation?

Answer 1

Humans decide to cut down trees for more space- to build houses or factories, or to develop for their needs. The trees may be needed for building houses or for paper products as well.
The effects of doing this is the loss of habitat for many species of animals. This may disrupt the community and ecosystem equilibrium that used to exist between the trees/vegetation and the animals.
Although not a major issue, plants and trees do produce oxygen, and drastic deforestation of rainforests (that contribute largely to the oxygen supply) may affect the amount of oxygen.
The way that people decide to cut down trees is another problem. Burning contributes to the pollution in the world. Using machinery also creates the same problem.

I hope that this helped answer your question!

Answer 2

the cause is always humans who are greedy for land cut down forests to build houses, farms, and other buildings. the effects are species dying out, loss of habitat, and those can result in problems like thinner ozone layer and global warming.

Answer 3

At present the way I read it we have more trees than we had 40 years ago.