Insert the missing phrases.

1) ... as a species has only been around for a short time compared to other species such as sharks.
2) Some people believe that we will have to ... once we exhaust the Earth’s resources.
3) The Earth’s resources are things we ... .
4) The planet is rapidly running out of gas and coal supplies but, fortunately, there are a number of ... .
5) He saw his role on the TV show as a ... to a film career.
6) With rising sea levels caused by global warming, anyone whose home is at sea level is living on ... .
7) As global temperatures rise, there is an ... that the Arctic will melt completely.
8) The ... for any footballer is to play for Real Madrid.