This article on reducing food waste includes a table that gives you definitions of the various kinds of dates on food packaging so you can decide when food is truly past its “eat by” date and when it is still good to eat.  While food safety comes always first, a lot of perfectly good food is thrown away because consumers are confused by the dates on the packages.  In addition to tips for individual households, the article discusses things that businesses and larger organizations can do to reduce food waste.  As the article states, reducing food waste can make a big difference in your sustainability footprint. 
https://earth.org/solutions-for-food-waste/

When you’re making choices about how to live more sustainably, remember that your safety is more important.  Don’t put yourself in a dangerous position just to make a tiny difference in sustainability.  Think about what could go wrong, and check at least one other reputable source when you’re looking at tips and hacks online.  Here are a few thoughts to get you started. 

• If the stairs are in a place that is unsafe, take the elevator if there is one and it appears to be the safer option. 
• Don’t use essential oils in the dryer and be careful not to use the dryer for rags that were oil-soaked before they were washed.  There is a potential for fire. 
• Never vent the exhaust air from a gas-powered clothes dryer into the house. 
• If you bicycle or walk to work or school, choose a route that is safe (traffic or otherwise) or pick another option such as a bus or car. 
• Don’t drive below the speed limit or slower than the flow of traffic.  Yes, you use less gas when you drive slower, but it’s dangerous for you and the other drivers around you when you impede the flow of traffic. 
• Check gently used items before you use them to make sure they’re safe.  Look for things like frayed electrical wires, missing safety guards, broken latches, or unguarded pinch points.  Safety standards have changed significantly for baby and child items, so make sure these used items meet safety requirements.  

I really like this article on xeriscape.  As the article states, many people think of xeriscape as a barren field of rocks; however, the barren field of rocks is actually zeroscape.  I have never liked the idea of zeroscape for all the reasons stated in the article (bad for the environment, creates heat islands, and is generally ugly) but am very much in favor of xeriscape.  Xeriscape uses native plants and careful watering strategies to create areas that support the environment, use much less water, and generally are much prettier.  I am currently planning a project to turn another area of lawn into a xeriscape area.  So, if you are considering xeriscape to reduce outdoor water use, think about the difference between xeriscape and zeroscape.  Xeriscape takes more planning and care, but is worth it. 
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https://landscapeunite.com/zeroscape-vs-xeriscape/