Barbecue grills can be problematic for two reasons. First, both charcoal and wood burn “dirty,” producing not only hydrocarbons but also tiny soot particles that pollute the air and can aggravate heart and lung problems.

It might be helpful to first define “socially responsible.” KLD Research & Analytics, a leading research firm that helps investors and investment professionals integrate environmental and social factors into their investment decisions, established the Domini 400 Social Index in 1990.