In Spain (not really a high-tech country overall) there are trains connecting the country corner to corner with trains that go at like 300 KM/Hour average. Considering that train stations are central, plus there is no need to be there like 2 hours before, plus you can easily work there, etc. it is way faster and more convenient than flight, and of course way more ecological.

I'm sure a little of all that VC money can be used to build such infrastructure... I got lots of downvotes for my original comment, but really, the amount of CO2 emitted by air travel is appalling. I understand it is hard to avoid in many situations, but at least let me feel sad about it.