But critics argue that these green tariffs aren't as effective as switching to a green supplier.

BBC: 28 MARCH

She wants to know why we didn't sign up with the green supplier a couple of years ago, when she wanted to do it.

BBC: 28 MARCH

Intel also reports on increased supplier assessments, renewable power and energy efficiency successes, employee engagement and green building design, among other topics.

ENGADGET: Intel wants to have conflict-free processors by the end of 2013