Jeremy Clarkson has hinted that the time may have come for him to leave Top Gear, likening himself to a dinosaur that nature had made a mistake in inventing. Photograph:  Paul Gilham/Getty Images.

Jeremy Clarkson has hinted that the time may have come for him to leave Top Gear, likening himself to a dinosaur that nature had made a mistake in inv(...)

The main greenhouse gas blamed for global warming averaged 400.03 parts per million at a monitoring station on Hawaii’s Mauna Loa volcano yesterday. Image NOAA

The concentration of carbon dioxide in the atmosphere surpassed 400 parts per million for the first time since measurements began, breaching a (...)