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Now that I'm out of the water, off the Esperanza and back on dry land, I've been thinking about what it takes to stop not just one oil rig but all of them.

There's no dodging the fact that the oil industry is immense. In the North sea, where we confronted Chevron, companies have spent more money on extracting oil in the region than NASA spent putting a man on the moon. In the Gulf of Mexico, where BP's Deepwater Horizon platform exploded this summer, there are over 3,500 other rigs ready to bore away at the seabed.

In Sydney, between drought and dust storms, the effects of climate change are becoming more visible than ever.

In this Voices for Change video Amanda McKenzie from the Australian Youth Climate Coalition explains how these changes are affecting life in a city increasingly vulnerable to storm surges and rising sea-levels.

The Copenhagen Climate Change Summit this December represents the best chance we have of reaching a deal to reverse current emissions trends in time to prevent climate chaos.

This is the first in a series of videos, Voices for Change, which talks to some of those who're already suffering aroung the world as a result of climate change. We'll be publishing more in the weeks running up to Copenhagen.