Tuvalu, indicated they would not support it. Mr de Boer described the accord as a "political letter of intent". He said that policymakers were now in a "cooling-off period" before beginning discussions on what they might want from this year's UN climate summit, to be held in Mexico at the end of the year. "The window of opportunity we have to come to grips with this issue is closing faster than it was before," he said. This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.