The first comprehensive report into the human cost of climate change warns the world is in the throes of a “silent crisis” that is killing 300,000 people each year.

More than 300 million people are already seriously affected by the gradual warming of the earth and that number is set to double by 2030, the report from the Global Humanitarian Forum warns.

“For the first time we are trying to get the world’s attention to the fact that climate change is not something waiting to happen. It is impacting seriously the lives of many people around the world,” the forum’s president, former U.N. Secretary-General Kofi Annan, told CNN.

Speaking to CNN’s Becky Anderson in London on Friday, Annan said the migration of people from newly uninhabitable areas presents a security issue that needs to be addressed by the United Nations Security Council.

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