I believe the answer is: I brought my own bag. Environmentalist would most likely aware that the plastic that stores used to pack up their product took very long to be degraded in soil, which would be really bad for the environment. To minimize this, they're most likely to bring their own bag when they went shopping.
The recklessness is defined as a state of mind where the person is aware of the fact that it is deliberately and unjustifiably taken up as an action and it disregards any risk form those actions and are blameworthy than the careless behavior.
