Paper, cotton, glass, and metal are greener than plastics.
Common plastics like PE, PP, and PET are the best choices according to multiple independent lifecycle analyses from all around the world. Replacing plastic leads to far more material used, more energy consumed, more waste, and more CO2. Because even though some CO2 is given off making plastics, overall they reduce carbon dioxide by 1. massively reducing food waste 2. massively reducing gasoline consumption of vehicles 3. reducing the use of coal, gas, and oil for heating through their thermal insulating properties. Studies that only look at the CO2 given off while making plastic are therefore very misleading. Lastly, it is important to note that plastic replacements like paper, metal, and glass give off vastly more CO2 when produced.
Source: Chris DeArmitt, "The Plastic Paradox - Facts for a brighter future", Chapter One "The meaning of green", pp. 23-49