Giant kelp (Macrocystis pyrifera) are an iconic canopy forming seaweed that can grow over 35 metres long and up to half a metre each day. Like trees in a forest, giant kelp modifies the environment and the resulting conditions favour a huge diversity of other species. Dr. Cayne Layton from the Institute for Marine and Antarctic Studies explains his research on restoring Australia's giant kelp forests. Cayne and his team are examining selected individuals from a range of these remaining populations to examine how warm tolerant their offspring are of warmer water.