Which of the following is a consequence of humans using fossil fuels

Explanation:

Following are a few consequences of fossil fuels

1. It causes air pollution.

2. When they are burned, they produce toxic substances which leads to global warming.

3. Waste products are hazardous to public health and environment.

4. They are non - renewable and unsustainable.

5. Drilling fossil fuels is a dangerous process

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Firstly, carbon isn't a metal.

Boron is a metalloid.

Beryllium is the least metallic alkaline earth metal, and lithium is the least metallic alkaline metal.

Both are metallic, and have metallic appearances and conduct electricity, but beryllium is more brittle than lithium.

So, I'd say Li and Be are equal.