Terrawatch: the adventurous icebergs that trigger ice ages

Antarctic bergs travelling north spark changes in ocean circulations and affect composition of our atmosphereHow does an ice age start? We know that changes in the Earth’s orbit around the sun alter the amount of solar energy reaching our planet, but it has long been a mystery as to how this triggers such a dramatic change in the climate. A study shows that Antarctic icebergs may be responsible for tipping the balance.Aidan Starr, from Cardiff University, and his team analysed sediments re