Does Chris Martin support any charities or causes?

Answer 1

Yes. From http://en.wikipedia.org/wiki/Chris_Martin:

Martin has been particularly outspoken on issues of fair trade and has campaigned for the charity Oxfam's Make Trade Fair campaign. He traveled to Ghana and Haiti to meet farmers and view the effects of unfair trade practices. When performing he usually has variations of "Make Trade Fair", "MTF" or an equal sign written on the back of his left hand and the letters "MTF" can be seen emblazoned on his piano.