IN 1800, CO2 levels were about 283 parts per million and by 1912 about 301ppm – look it up.

By 1989 CO2 levels had reached Dr Hansen’s so-called safe level of 350ppm.

Today levels are about 411ppm, due almost entirely to China, India and developing countries and hundreds of new coal-fired stations to be built over the next decade (see Obama and China’s agreement to at least 2030.)

But we ...