The busy pop superstar finished off his week by raising the profile of humanitarian causes close to his heart.

On Thursday Martin added his voice to that of many other celebrities supporting the “Arctic 30” Greenpeace protesters recently arrested in Russia, writing on Facebook:

“30 people are facing charges of hooliganism in Russia for standing up to protect the Arctic from dangerous oil exploration. Stand with them to have the charges dropped, and help protect the Arctic for everyone.” Click here