I subscribe to a number of golf publications to keep up to date with industry advancements. I've cut my print subscriptions down throughout the years and instead sign up for a lot of web-based e-zines.
One of which is the Golfdom Insider. Golfdom is a great source of information for anyone who works in the golf industry, they aim to be an "upscale publication designed to fill the niche between the highly technical association journal and the newsy tabloids".
They cover a huge amount of environmental issues, here's a few links from their site:
Joe Hubbard - The Natural
ASGCA Issues Sustainable Development Guidelines
From Food Waste to Fertilizer
Solar Golf Cars
Audubon in Action
Turfgrass Trends (a number of links)
Environment Still Number 1 Concern For Golf
Podcasts : Biodeisel, Snow Mold (Mould for you Canadians), Syngenta Professional Products - Meridian insecticide
Videos: Fertilizer Prices, Golf and Environment,