Environmental effects interlinked several thousand miles away

PBS "Nova" in this afternoon had "Earth from Space". It is astounding that the vast amounts of brine sediments in the Antarctica during winter is the major factor to stabilize the worldwide sea temperature within 1 deg.C. The ancient plankton in Sahara Desert in north Africa contribute to the vast swathe of verdant Amazon rain forest in South America. What we have done to the environment may affect people and living organisms even several thousand miles away and vice versa.