When you're "conscious" of a problem, it means that you know about the problem and think about it when you're making decisions. Things that people often say they are "conscious" of are:

• the environment ("environmentally conscious")
• problems with society ("socially conscious")
• their health ("health-conscious")

When you are "environmentally conscious", it means that you are a person who thinks about protecting the environment. Environmentally conscious people support recycling, limiting carbon dioxide emissions, protecting endangered animals, and so on.