As an active enviromentalist, Prince Charles is once again expressing his concerns.

While speaking at a reception for the Commonwealth Heads of Government Conference at Clarence House on Wednesday, the Prince of Wales expressed that the next 18 months will be critical for humanity to survive climate change.

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“I am firmly of the view that the next 18 months will decide our ability to keep climate change to survivable levels and to restore nature to the equilibrium we need for our survival,” Prince Charles said per the Daily Mail ahead of a series of meetings between the United Nations and world leaders on climate change that are expected to be held in London next year. The Conference of the Parties is where actions to reduce greenhouse gas emissions are negotiated.

There will also be the UN Convention on Biological Diversity to be held in China, the UN secretary general’s Climate Action Summit in September as well as 2020’s Commonwealth Heads of Government meeting to be held in Kigali, Rwanda all aimed at dealing with climate change.

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In 2017, Prince Charles co-wrote The Ladybird Expert Book On Climate Change aimed at educating adults about the changing world.

At the current rate of greenhouse gas production, the World Meteorological Organization expects that the Earth’s temperature will rise at a rate between 3C to 5C by 2100.