Lucia Liljegren is an American mechanical engineer who has worked at the Pacific Northwest National Laboratory (on projects related to remediation and storage of radioactive waste) and as an Assistant Professor in the Department of Aerospace Engineering at Iowa State University. She is best known (as Lucia) for her global warming/climate change blog The Blackboard (Where Climate Talk Gets Hot!), online since 2007. Professor Judith Curry, a climatologist at Georgia Tech, calls Lucia “probably the least controversial person in the climate blogosphere, because of her cheerfulness and sense of humor, honesty, and open mindedness.”  And Thomas Fuller, who writes a popular column on a "liberal skeptic's view of environmental issues" for Examiner.com, says The Blackboard is one of the two places on the Internet where "qualified people from both sides of the debate on climate change can actually have a civil discussion about issues of scientific substance." He adds, "Lucia is impossible to dislike, I think."
In the climate change debate, Lucia classifies herself as a "lukewarmer": a person who recognizes global warming, but doubts the severity of the problem, and the certainty of climate science predictions.
Lucia also blogs as "The Knitting Fiend," online since 2004.