As with Europe’s new carbon trading, all producers and consumers around the globe will need to face market incentives to adopt technologies and consumption patterns that slow (and eventually stop) the increase of greenhouse gases in the atmosphere. We will all need to pay a “market price” when we contribute to global climate change, so that we give true economic incentives to sustainable energy systems and new public investments – for example, mass transit – that reduce greenhouse gas emissions and thereby head off future climatic disasters.