Is it OK to burn 2x4 in fireplace?

Chef's answer
Because they are bark-free, and are usually stored indoors, this is a very low risk wood choice. ... Treated wood is highly toxic when burned. Make sure to keep any treated wood separated from the clean 2x4s pile to avoid accidentally burning hazardous chemicals like arsenic.
Frequently asked Questions 🎓
And How to Prevent It The quick answer is yes. Freezer burn is simply the result of air coming into contact with food, and while it may not looking appetizing, it is usually safe to eat. However, since freezer burn often affects the flavor and texture of food, you may not want to consume food with severe freezer burn.
Contrary to what some people believe, freezer-burned meat is safe to eat. However, that doesn't mean it's going to taste great. The real damage of freezer burn is that it causes a dry, leathery texture. The flavor will also depreciate, a sign that it's lost its freshness.
How long will frozen scallops remain safe to eat? ... If dry spots or discolorations have developed on the frozen scallops, freezer burn has begun to set in - this will not make the frozen scallops unsafe to eat, but it will harm the texture and taste..
While freezer burned food is completely safe to eat, it certainly has a negative effect on the taste and flavors. When you take a bite out of a cooked steak that underwent freezer burn, it will taste dry and nearly flavorless due to the loss of water molecules that contain much of the food's flavor.
Chicken may appear to be pinker or take on a bright white hue, whereas beef can turn a shade of brown. In these instances you might be inclined to toss your meat, but USDA officials say that any meat affected by freezer burn is safe to eat.
Freezer burn is the result of moisture loss from storage in the freezer. It leads to changes in the quality of your food and may result in ice crystals, shriveled produce, and tough, leathery, and discolored meats. Despite the quality changes, freezer burnt food is safe to eat.
A few more cooking questions 📍