Four ways people may be harming the environment without realizing it are: 1) Driving for short trips and errands instead of walking, biking, or using public transportation which contributes to increased carbon emissions. 2) Not shopping online which can reduce carbon emissions from transportation compared to driving to stores. 3) Throwing away food past expiration dates when most dates refer to quality not safety, which leads to unnecessary food disposal and shopping trips. 4) Storing fruits and vegetables in the refrigerator rather than the freezer, as freezing can allow produce to last up to a year and half, reducing shopping frequency.