[ZenGum]

About the cows, some bio-boffins in Australia have noticed that kangaroos eat the same food as cows, extract 10-15% more energy from it per kilo, and produce virtually no methane.
The first step is for Australian to eat more 'roo and less beef (much better for the environment for other reasons as well ... hard-hoofed animals do lots of damage to the Australian landscape).
The second step is that the aforementioned bio-boffins have worked out that kangaroos can do this because of the specific bacteria in their guts, and are now working to adjust this bacteria so it can be given to cows.
If this works we can have cows that need 10% less feed and produce no methane. Fingers crossed.