Cities at the heart of climate emergency

I discuss the special place of cities in the general problem of climate change emergency, both mitigation and adaptation. After reviewing why cities matter enormously, I turn to a brief presentation of their strengths, weaknesses, opportunities and threats, then focus on some key model problems such as food or urban renovation, plus a few highlights (mobility, schoolyards, adaptation plan). Some specific cities are taken as illustrations, including Paris. Throughout the discussion, natural and human sciences are blended, as well as scientific and political analysis.