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Fact #1. Electric mowers are easier and cheaper in the long run. They don't have complicated parts that will need cleaning and replacing. You won't have to deal with spark plugs and filters and oil. Instead, it's just a battery. Plus, charging will almost certainly cost less than replacing gas.
Fact #2. Once you opt for an electric mower, you have one major choice to make. They come in both corded and cordless, or battery powered, models. The former are going to provide more cutting power. They will also be able to be used as long as they are plugged in. The latter can be more convenient, though. The big difference is that you won't have to wrangle any cords. That saves time and helps you get into tight spaces.
Fact #3. Push mowers have been around since the 1830s. The ones produced today sport basically the same design. At that time, it was a great advancement. Prior to those models, grass was cut either by animals or scythe. The first required significant investment, and the second significant labor. Being able to push a simple machine made a lot of sense.
Fact #4. Advancements in lawn mowing were relatively slow. At first, people just made larger and larger push mowers. They eventually got to the size where they were being pulled by grazing animals. It took until the 20th century to get gas powered motors. And since then, things have largely stayed the same.
Fact #5. The environmental impact of electric lawn mowers is difficult to gauge. In your immediate vicinity, electricity is going to burn cleaner than gasoline. That's just common sense. But a good portion of the electricity in the USA is powered by coal. That industry still produces a hugely negative environmental impact. The main difference is that different sources are being found. As the power grid changes, so will your mowers impact. That's not the case if you stick to fossil fuels.