Honeybees, climate change and pollination

Why is the sun so good at removing tomato stains? Why do plants change colour in response to cold weather? And are we getting closer to what was portrayed in the movie Avatar? 

Dr Rose Kerr and Dr Clancy Lester answer these questions and more on triple j Mornings with Lucy Smith. Got a question for Dr Karl - submit it here https://ab.co/askKarl