Let me pay tribute to my hon. Friend, who is standing down. We did not always agree on every issue, but she pursued the issues that she cared about passionately and with great idealism. She asked about carbon constraint. We are living at the moment as if there were three planets on which to live, rather than one. That sums up our excessive use of carbon in this country. Carbon budgets are an important step forward in constraining what we do, Department by Department and sector by sector.
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