Some very clever people believe this

Jeffrey Sachs is the Professor of Sustainable Development, Professor of Health Policy and Management, and Director of the Earth Institute at Columbia University, is also Special Adviser to the United Nations Secretary-General on the Millennium Development Goals.

Climate change is the greatest of these environmental threats (though by far not the only one). Given the current trajectory of global fossil-fuel use, the planet’s temperature is likely to rise by 4-6 degrees Celsius above its pre-industrial level, an increase that would be catastrophic for food production, human health, and biodiversity; indeed, in many parts of the world, it would threaten communities’ survival. Governments have already agreed to keep warming below 2º Celsius but have yet to take decisive action toward creating a low-carbon energy system.

To which Duggan’s Dew replied: “The cancer has reached his brain”.