If hydrogen were to replace fossil fuel entirely, the researchers estimate that 60 to 120 trillion grams of hydrogen would be released each year into the atmosphere, assuming a 10-to-20-percent loss rate due to leakage.
The Fire TV can have a wired connection, the Fire TV Stick is wireless only. The Fire TV has Dolby Digital Plus & 5.1 surround sound, the Fire TV Stick is Dolby Digital Plus only. The Fire TV can do all Amazon games including hi-res video games, the Fire TV Stick only has a limited set of games it will play.
The Fire TV Stick supports up to 1080p, which is Full HD. The Fire TV supports up to 4K Ultra HD, around four times the resolution of 1080p. That's also part of the reason that the Fire TV supports the faster WiFi standard, but you will also need a really fast and reliable internet connection to stream 4K content.