affect

Which Means:

To affect something is to have an influence on it.

What can you do to affect the environment in a positive way?

This verb means to have an effect but it is not spelled like effect!

To effect something is to make it happen, to cause a change.

John effected many changes when he became president of the club.

Do not confuse this verb with 'affect', which we also had today. To affect is simply to influence something.