Activists Aim to Block Japan's 'Scientific' Whale Hunt

A Japanese whaling fleet is set to sail to Antarctica this week, pursuing over a thousand whales — some of them humpbacks.

This is the first time in years that Japanese hunters have openly sought humpbacks. The government of Japan says the hunt is intended for scientific research. But Greenpeace and other critics contend that Japan's intentions are commercial.

Karli Thomas of Greenpeace talks with Melissa Block.