It is a tragedy that species all around the world are dying as a result of human carelessness and recklessness, but what is even more sad is the fact that although we are aware of the negative consequences of our actions, we have failed to make extreme changes to our ways and practices to reverse current trends. This is demonstrated by continued rapid deforestation and global climate change.

Scientists are concerned that despite current efforts to reduce the loss of forests and rainforests, they may be too late to prevent the continued extinction of certain species. These species may not be able to survive in what is left of their former homes and food and water resources. As plants are killed off by deforestation, it becomes harder for pollination to take place. In turn, animals that are dependent on these plants for either food or shelter are threatened. Also, as a species decreases in population, the chance of two members of that species finding each other and reproducing successfully grows less and less. 

Many species are trying to migrate away from the effects of climate change, but because of reduced forest habitats everywhere, they are confined to areas where they must face the full onslaught of climate change. Also, warmer temperatures mean that some animals which were originally confined to certain temperature zones are now able to spread out into the habitats of other species. This is demonstrated by the upward movement of mosquitoes, which were limited to the warmer areas below 4,800 feet, into the habitats of other birds and mammals, spreading diseases such as malaria.

Source: http://rainforests.mongabay.com/0908.htm