If you've been to the supermarket lately, you may have noticed your salad items costing a lot more like lettuce, spinach and kale. It's because farmers have had a tough time with these crops recently because of warming temperatures. 

Maybe you also noticed the egg section looking much more empty. That's because there's a national egg shortage. What can consumers do? Phil Lempert is a retail analyst and "Supermarket Guru"​ who runs SupermarketGuru.com.