But as Yahoo News reports, some experts, including the scientists involved in the study, are toning down the rhetoric.

FORBES: Wi-Fi Might Not Kill Trees After All

Scientists, including some of those at the IPCC, have sometimes played along with this, looking for harbingers of catastrophe to act as goads to change.

ECONOMIST: Climate change

Indeed, the sports scientists say that some people - including pregnant women and those aged 65 or older - might be advised to do slightly less exercise and modify the type of activities they do.

BBC: NEWS | Health | Exercise 'must be tough to work'

The drug does cause side-effects in some patients, including, rarely, cancer of the lining of the womb, but the scientists said that the increased chance of preventing breast cancer returning far outweighed the risk.

BBC: Breast cancer

But Finnish scientists from the Helsinki City Centre for the Environment warn that many earrings exceed these limits - including some billed as gold or surgical steel.

BBC: Earring