Question

Which of the following would reduce your carbon footprint?

choosing paper instead of plastic grocery bags
riding a bike to school instead of walking
using re-usable glass plates instead of paper plates
using hot water instead of cold water to wash your clothes

Answer 1

re usable glass plates instead  of paper plates

Answer 2

Using reusable glass plates instead of paper plates.

Both riding a bike and walking reduce your carbon footprint.
Also, washing clothes in cold water and hanging them dry reduces carbon footprint. Using hot water increases it.
Although plastic bags are not ideal, they are almost irrelevant to climate change.