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Ancient oceans were starved of key nutrient

Ancient oceans were starved of key nutrient

The Earth's ancient oceans held much lower concentrations of sulphate - a key biological nutrient - than previously thought, a new report says.

Earth supports one-third less life than estimated

Previous estimates about the total mass of all life on our planet have to be reduced by about one third, according to a study by a German-US science team.

`Ozone layer no longer disappearing`

According to UN scientists ozone layer could be back to full strength by middle of this century.