Today is Earth Day, an occasion for reflecting on ways to improve our stewardship of the planet and its resources.

That effort can include becoming better informed on climate change and the level of greenhouse gases in the atmosphere.

Go online to www.honoluluadvertiser.com/opinion to see a video explaining one international outreach effort, the Web site www.350.org. The number refers to the parts per million considered a prudent upper limit for carbon dioxide in the atmosphere. One of its founders, environmentalist Bill McKibben, says this simple awareness-raising approach can resonate globally.

Hearing his comments online — and visiting the site — would be one good way to start the day's observance.