Today's question: If the CEO of Unilever asks you to take a colder shower in order to prevent CO2-induced hurricanes, what is your reply?

Unilever Wants Short, Soapy Showers and Long-Term Investors - Bloomberg

General Electric CEO Jeff Immelt, meanwhile, regretted stepping out in front. "If I had one thing to do over again I would not have talked so much about green," Immelt said in May 2011.

How is Unilever doing? It has made great progress in reducing waste, water consumption and greenhouse gas emissions at its factories. But most of the company’s carbon footprint comes from heating water for the showers where customers use its soaps and shampoos.

Persuading people to take shorter or colder showers is difficult. “This is by far our biggest challenge and as yet we do not have a viable solution,” the company said in its April progress report.