For millennia man has been changing the landscape, hacking and burning forests and ploughing up grasslands.

ECONOMIST: Climate change

Yes, it is true that one farmer ploughing up another 500 acres of Nebraska does indeed change the supply of wheat and thus the prices of wheat around the globe.

FORBES: Debunking Steve Keen's Debunking Economics

"When the enemy trained a gun on me, a round shot struck the ground not more than thirty feet in front of me, ploughing up the turf many yards, " he wrote on May 2, 1862.

FORBES: War Story