Now when I look at the exclusive private beach not far from the Esperanza, I can picture the beautiful coral reef that was destroyed to make way for it. I wonder if the guests realise they're standing on a coral graveyard. This marine life needs to be respected and protected. We're heading out of the Red Sea, but we're not going to stop fighting unsustainable coastal development.

Meanwhile, there's been plenty of action on the Rainbow Warrior. Our activists have been threatened by pirates in the Mediterranean while attempting to stop illegal driftnet fishing.

Well, it's been an absolutely incredible two weeks. I've followed fishing vessels around the Mediterranean and discovered the crisis state of bluefin tuna populations. I've seen beauty and destruction of the marine life in the Red Sea. Seeing it all in front of you really brings home the enormity and urgency of the problem - we need to protect marine ecosystems before it's too late.

It also made me immensely proud of the work that we do as Greenpeace - crew, cyberactivists, we all play a part. I'm off to hassle all my friends to sign up as Ocean Defenders. I hope you'll do the same.