Natural gas is substantially more dense, easier to store, and can be produce from carbon neutral sources.

There’s definite European involvement. But it might be more accurate to call the company a multinational company, given that a majority of the workforce and a majority of the owners aren’t in Europe. Essentially the company is based in Europe for tax purposes. Maybe after the merger you can call it European.

It's debatable how "European" OneWeb is. A majority of the company is owned by Asian companies. The satellites are built in Florida. Then the satellites are launching on American and Indian rockets moving forward.

Mars does have a carbon cycle, and seasons, and the climate has changed over time. That’s a big focus of study by the Mars rovers. Here’s a recent article about Curiosity studying the climate of Mars. Curiosity and Perseverance also have weather stations. Here is the recent weather data from Curiosity, and here is the recent weather data from Perseverance.