Could years of drought in India strike again, bringing famine and mass migration? New science says "yes". Professors Gayatri Kathaya and Ashish Sinha explain. NCAR scientist Kevin Trenberth reports two marine heat waves right now. Endangered tree expert Malin Rivers with a survey of global trees. Scientists warn almost a third of tree species are in danger of extinction.
Interviews by Alex smith of Radio Ecoshock
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