Students in Maryland are going green in order to graduate.

The state's board of education has passed an environmental literacy graduation requirement.

Under the rule, public schools will have to infuse environmental lessons into core subjects. Students will learn about about key "green" concepts like conservation.

Teachers will be able to implement the new program in a manor that best fits their schools, but curriculum must align with state standards.

Maryland is the first state to take on an environmental literacy requirement.

Forty-eight other states are now considering similar moves.