Meat lasagna for vegetarians isn't just healthier for you – it's healthier for the planet too. And a new study shows how much each swap, such as swapping beef for chicken, saves greenhouse gas emissions. Switching food and drink purchases to very similar but greener alternatives could reduce greenhouse gas emissions from household food by almost a quarter, according to a new study by the George Institute for Global Health and Imperial College London. (Paulina Smolinska, more at msn.com)