The global population has increased because much better levels of nutrition.

One effect of global warming is that sea levels are rising because the polar icecaps are melting.

A consequence of the fact that we all have cars is that more and more CO2 is being released into the atmosphere.

This rise in temperature effects the climate in many countries worldwide.

Building factories near rivers is one of the reasons of water pollution.

It is not easy to generalise, simply because there are many causes of pollution.

There are a number of reasons that there are so many environmental problems.

One of the consequences of modern life-styles is that we are consuming the Earth's resources far too quickly.