If you're even just barely paying attention to green topics these days, you have at least heard about LEED, the Leadership in Energy and Environmental Design program. But I'd wager you haven't yet heard about Regreen, which was unveiled only last month. You could think of Regreen as "LEED for home renovations and design," if not for several big reasons that you can't.

Like who cares, but I happened to notice as I was opening this window that it's my 300th post. And it's about ... someone else's posts. Worldchanging.com has had a couple of good ones in the past couple of days: Alex Steffen wonders about the freebies that are available to the energy-efficient, and cites as an example the Freeaire system for refrigeration units.

The first time I was exposed to the notion that water rights would provoke warring among nations was back in college, where it was an interesting concept but hardly seemed imminent.

Now, as detailed by Sarah Schweitzer in the Globe this morning, the fight has even come to central Mass.

The story I had in the Globe real estate section a while back on the PowerHouse Enterprises home in Lawrence led to one I had yesterday, about a home nearing completion in Westport that hopes to rely mostly on ground-source heat pumps and a wind turbine for its utility needs. If you know of any other homes that oughta be written about, please be in touch.

This morning's newspapers bring interesting troika of news tidbits, and I don't know where to start. At the very top of the Times is a report on its right track/wrong track poll, which reached a nadir, or zenith, of 81 percent thinking we're on the wrong track, a more extreme opinion than at any time since the poll was undertaken in the early '90s. (Thank you, Mr. President.) With a result like that, and with the landscape in general littered with broken dreams and promises, one could easily conclude we're headed for disaster. 

I'm at the Seaport World Trade Center again this morning — "again" because I spent the day here yesterday, and because this was the site of NESEA's Building Energy '08 a couple of weeks ago. The occasion this week is ResDesign, the annual residential design and construction show sponsored by the Boston Society of Architects. Halfway through, I'm finding it somewhat less thrilling the BE'08, almost certainly a reflection of my interests, rather than their programming.

I know practically nothing about Roslindale Green and Clean, but in pursuit of a story I'm doing for the Globe magazine, I saw a listing for its fourth annual Green Garden Exchange this weekend. The theme of the show, which is Saturday from 11-2, is Green Living, Creating a Sustainable Community.

I will not get there, but their list of topics makes me wish I could: Lawns without pesticides, CSAs, recycling and composting, plants for urban gardeners, growing vegetables and herbs in containers, etc.

The event is at 10 Birch St.

So now the three days of Down:2:Earth are done, and I've got plenty to share — more than I think I will have the bandwidth for. It wasn't as bad as the information bulge that resulted from BE'08, which I'm still trying to work through, but then again, d2e wasn't nearly as monumental. Nevertheless, it is a credit to the show that there is more to report on than there is time to report on.

Numbers have no meaning until we attach it: 365 days, the 747, 1-20-09. So far, I wouldn't say 350 has been tagged, but the environmental writer — and, increasingly, activist — Bill McKibben and some compatriots intend to change that.

Who could not like this, via Boing Boing? An artist has fashioned animals from discarded plastic bags and affixed them to subway grates. When trains whoosh by underneath, the force of air breathes life into the animals, and then they relax again until the next burst.