Farewell and thanks for reading
This is my last entry for this page - I'm leaving the BBC to work, initially, on ocean conservation issues.
While this page will no longer be updated, it will stay here for reference.
I hope you've enjoyed reading my blog down the years - I've enjoyed writing it, and have appreciated your comments.
To keep up to date with news and views about the environment, I hope you'll keep reading the science and environment pages of the BBC News website, the thoughts of my successor Matt McGrath, and my science correspondent colleagues Jonathan Amos and David Shukman.
Whaling moves beyond the harpoon
Whales snared in ocean debris
How many whales are snared and killed by fishing gear and ocean debris each year? No-one knows for sure - but the number entangled is probably huge, and the number dying significant.
Over the past few years, the International Whaling Commission (IWC) has been starting to address this issue more seriously than before.
South Korea's whaling: Faux and cons
This is the eighth meeting of the International Whaling Commission (IWC) that I've covered; so I'm always a bit chary of the possibility that over time I've become a more grumpy, wizened, curmudgeonly old cynic than the organisation's politics might merit.
So it's been refreshing to chat with a few first-timers this year - and confirmatory that some of them, after just three days of what's been a functional meeting by recent standards, already find the waters of hypocrisy and selective memory running deep and strong.
Whales, gas and climate: A gray tale
Whaling: From 'bloody' to 'boring'?
If you have a thought to spare this week, spare it for Tony Burke.
The Australian minister for sustainability, environment, water, population and communities is due in Panama City for a couple of days to bang the drum for what has been his country's favourite environmental cause - whaling.
Rio: Worth the effort?
All the environment groups here have been going around saying that from a green perspective, Rio has been a failure. I'm not sure why, seeing as governments have promised to stop carbon dioxide emissions immediately.
You didn't know? I'm not sure government negotiators know either. Certainly US chief negotiator Todd Stern, who usually purveys a smooth brand of spin, waffled more than I've ever heard him when I raised the issue at a news conference.
Rio summit: Little progress, 20 years on
On the final day of the UN sustainable development summit in Rio, UN chief Ban Ki-moon has urged governments to eliminate hunger from the world.
The secretary-general said in a world of plenty, no-one should go hungry.
Poems and politics at the heart of Rio
It's not every day you get to buy a poem for the price of a cup of coffee. If you like the idea, Nelio Fernando is your man.
Choosing a word that I hope will work in Portuguese, I ask him for something "ambientale" - environmental - and he begins to declaim.