You'd probably find the idea of an event for trading in rhinoceros horns or tiger skins pretty shocking. But today, 1,600 companies from 80 countries came together in Brussels to trade all sorts species, including some threatened and endangered ones: fish, also known as our global marine life.

The Brussels Seafood Expo is the world's biggest sea food trading event, where species on the brink of collapse - like Mediterranean bluefin tuna and North Sea cod - are, literally, served up on a plate.

We had Fossil Fool's Day last week with plenty of action around the country to highlight the dangers posed by coal, but the dreadful punning doesn't stop there. Continuing the theme, next Tuesday is April Biofool's Day which admittedly falls on the 15th rather than the 1st, but that's because the Renewable Transport Fuel Obligation (RTFO) - which will overnight increase our consumption of biofuels - begins to make its presence felt.

On the day, the good folks at Biofuelwatch and the Campaign against Climate Change are organising a protest outside the home of a certain Mr Gordon Brown, Number 10 Downing Street. You can join the crowds outside Number 10 from 6pm and further details are on the websites of both organisations. If you can't get there, you can still do something - write to transport secretary Ruth Kelly with your concerns about this rush towards biofuels.

Meanwhile, concerns about biofuels are rising up the political ladder, as last week UN secretary-general Ban Ki-moon called for a review on global biofuel policies. Our government currently has the indirect impacts with biofuels under review but the results aren't due for some time, and certainly not before Biofool's Day next week.

Kingsnorth in Kent is to be the main focus of this year's Camp for Climate Action. From 4th to 11th of August climate activists will gather at the site of E.On's proposed new coal-fired power station, the first to be built in the UK for 30 years.

Two audacious and well executed climate actions have deservedly grabbed headlines this week - Plane Stupid's 'No third runway' banner drop on the House of Commons yesterday perfectly complimenting our own Heathrow Airport plane protest on Monday. Both sets of activists involved spoke eloquently to the media about why they were there: to expose the government's 'public consultation' as a sham, and to remind us all that climate change is the greatest threat that we face, and we have little time to start getting serious about it.

Plane Stupid protest at the Houses of Parliament

Another day, another voice loudly opposing plans for a new runway at Heathrow. Today, Plane Stupid campaigners have scaled the Houses of Parliament to protest at the collusion between government and the aviation industry.

In the absence of a genuine consultation with Londoners, the protest is a brilliant way to get the word out on the day the Heathrow 'consultation' ends. They've dropped banners reading 'BAA's HQ' down parliament's facade, and are enlightening the great and the good on their way to Prime Ministers' Question Time below by throwing paper aeroplanes - made from secret Whitehall documents that prove BAA has written parts of the consultation and the government has already decided to build a third runway - from the roof.

Anna (left) at Heathrow airport yesterday

I’ve been campaigning a long time, though I've never done anything quite like this. Walking out onto the tarmac of the world's biggest airport and climbing onto a plane wasn't like any other Monday morning I've experienced. But with no sign of the government changing its mind on airport expansion, it was a step we felt had to be taken.

Written yesterday for The Guardian's Comment is free.

Today's Greenpeace demo at Heathrow upped the ante of climate change activism. But if that's what it takes to get the government to act...

In 1971, the United States government proposed testing its nuclear arsenal near the tiny island of Amchitka - a wildlife paradise off the west coast of Alaska. A number of protest groups sprang up. One particular group of people came together with the idea to charter a boat - the Phyllis Cormack - and sail it into the nuclear testing site. Through placing themselves in the area of the bomb blast, they wanted to draw a line in the sand, and to make sure that the whole world would bear witness to what their government was doing. Later, the US government called off its tests. Greenpeace was born.

The video of yesterday's protest at Heathrow:

A few pictures from today's plane-top protest at Heathrow:

Hanging the banner on the tailfin
© Greenpeace