Britain's Queen Elizabeth II on Monday called on the Commonwealth to help the most vulnerable nations deal with the impact of climate change.

The 53-nation Commonwealth of Britain and its former colonies includes some of the world's wealthiest countries as well as some of the poorest.

"The impact of pollution falls unequally: it is often those who pollute the least — notably in the world's least-developed nations — who are closest to the razor's edge: most affected by the impact of climate change and least equipped to cope with it," the monarch said in a Commonwealth Day message.

She adds that environmental choices open for same nations are not available to all.

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"In some parts of the world, for example, fossil fuels can be used more sparingly and buildings can be made of more efficient, sustainable materials; but it is far harder to expect someone to adapt if he or she relies on the trees of a local forest for fuel, shelter and livelihood.

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