The chief of the Environment Agency said last year's extreme weather showed the "urgent need" to plan for a "changing climate". Sir Lord Smith said:
The extremes of weather that we saw last year highlight the urgent need to plan for a changing climate.
More of this extreme weather will exacerbate many of problems that we already deal with including flooding and water scarcity, so taking action today to prepare and adapt homes, businesses, agricultural practices and infrastructure is vital.
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Some 66 people have been killed after the plane they were travelling on crashed in southern Iran.
The letter calls for an end to harassment, abuse, and impunity in a world "ripe for change".
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.