Scientists dropped onto the floes by helicopters and dinghies - and collected samples. It shows air pollution is more widespread than previously feared, they say.
British and Danish researchers found the continent could produce more than 100 times the energy it currently does from the farms.
The strongest association was found with ground level ozone, which was also linked to a decline in lung function.
Scientists say that soil across a huge part of the continent, including western Ethiopia, is producing the gas because of drought and changing land use.
His speech at Sydney’s Conservative Political Action Conference has been leaked to newspapers.
The veteran BBC presenter said overweight people could stop the country being overpopulated if they die a decade earlier than the rest of the population.
Shadow chancellor John McDonnell said: "We would not block something like that. We would let the Scottish people decide. That’s democracy."
A study has found marine ecosystems are suffering them frequently putting plant and animal life at risk - and the people who depend on them
Current reform proposals of the EU Commission on the Common Agricultural Policy (CAP) are "unlikely" to improve environmental protection, say scientists