I just received this terse question from a reader: “What’s the ROI (return on investment) on solar thermal?”

I responded, hoping to prompt more discussion: “That’s an interesting but impossible question to answer. What is the nature of your interest in the (more…)

On Thursday, December 16, 2010, the United Nations launched its Decade for Deserts and the Fight Against Desertification (UNDDD).

The initiative is retroactive, running from January of 2010 to December of 2020, and aims at increasing global awareness of the nearly one billion humans in 100 countries (more…)

Lester Brown has for years been unwavering and persistent in drawing attention to the gathering environmental dangers humanity faces and pointing to the alternative practices which might yet save us from the worst effects. His widely read Plan B books have appeared at regular intervals throughout the last decade. I reviewed the fourth of them on Celsias in (more…)

The number of cars on U.S. roads dropped by 4 million in 2009, the only large decline in the nation’s car fleet since the government began keeping records in 1960. While consumers bought 10 million cars during the year, another 14 million vehicles were scrapped, dropping the total to 246 million vehicles, despite the government’s “cash for clunkers” program that gave individuals as much as $4,500 to exchange older cars for more fuel-efficient models.

Analysts cited numerous factors for the decline, including high gasoline prices, improved public transportation, and the popularity of online social networking, which for many teens has replaced the automobile as a way to socialize. In a report analyzing the decline, the Earth Policy Institute says the decrease is not merely a temporary phenomenon caused by the recession. (more…)