How does cutting of trees affect tigers?

If everybody is cutting down rainforests around the whole world, then the animals and food chain that are living in the rainforest will be affected and disturbed. Animals including the worker ants, geckos, jaguars, deers, green tree frogs, the red eyed tree frog and so many more other animals, will be affected. Since more humans populating the world, if more rainforests are been cut down, then there won't be enough trees to produce enough oxygen for us to breath, therefore, humans could become extinct and so could some animals that depends on oxygen to live.