When something is used or broken (or we just don't want to deal with it) it usually ends up in the trash can. What most of us don't realize is that lots of these things are classified as "hazardous household waste," meaning it's actually dangerous to throw them away. Then there are those odd things that look like they could be recycled, but you're just not sure: so you chuck them in the garbage too. Bad human! That's why we've assembled this helpful list. Use it to know which items are too hazardous to be tossed, and what to do with them instead.
Take any and all rechargeable batteries to your nearest RadioShack or BatteriesPlus for safe, free recycling. If the batteries aren't rechargeable, aka alkaline, drop them off at the nearest Household Hazardous Waste (HHW) facility. Info about how to find one in your community at the bottom of this post.
Fluorescent bulbs (including those curly CFLs) contain toxic chemicals, and should never go in the trash can. Some large retailers — like Home Depot and IKEA — offer CFL recycling services for bulbs purchased through them. Or you can search RecycleABulb.com for local disposal options. Most LEDs are safe and can be recycled--check the packaging for details.
Find responsible e-waste recyclers at e-Stewards.org, or use a buy-back program offered through the manufacturer.
If you pour these into the trash while they're still hot, it will wreck the bag and create a nasty mess. Even solidified, it can still cause gross problems at the waste processing facility. Pouring them down the drain is an even worse idea.
Bacon fat can be strained into a jar and saved in the fridge as a substitute cooking oil. Small amounts of other oil can be placed in tightly sealed, unbreakable containers in your everyday trash, or taken to a collection center in your area (it's often recycled into auto fuel!).
Using chemical-based pesticides, herbicides, and fertilizers is terrible for the environment and I strongly urge you to consider non-toxic alternatives. But if you DO use these chemicals, never put them in the garbage or pour them down the drain. The best way to deal with leftovers is to give them to someone who will use it. Otherwise, take it to the nearest Household Hazardous Waste facility.
Fortunately, there are cosmetic recycling programs.
Because they contain solvents and other toxic chemicals, glues and adhesives can't be disposed of in their original form. Either let them dry completely (just like paint and stain) or spread thin layers on cardboard or newspapers and allow to dry before tossing. As always, you can also take to a HHW facility.