GM Crops - they grow in hardier conditions than regular crops, can be used to re-green desserts and prevent deforestation (the majority of rainforest hack'n'slash is locals trying to find arable land).
They also subjected to over a hundred different tests to ensure they're safe for human consumption. Regular crops (esp organic) are subject to just seven. One of those being "Yeah, it looks like a tomato". I know which I'd prefer to eat.
(if the Spanish cucumbers that're causing problems in Germany right now were GM the testing done wouldn't spotted the e.coli and saved lives)
Food for all.
Hydrogen Power - a perfect replacement for petrol powered cars, yes it's not "efficient" as directly electrically powered cars but they don't need the batteries which are mined & parts built all over the world before coming together plus they allow three very good side effects.
Currently 60% of the cost of petrol in the UK is tax, where's this income going to come from when folk drive electrical cars? If it's shifted onto electricity then you're paying more to use your computer, watch tv or get a shower. Having hydrogen power means these taxes can stay on the fuel.
Nuclear power is needed to power the addition demand the increased population, green alternatives don't cut it - wind power for instance is highly variable and in December of last year the combined output of the South East wind farms was less than it's draw (turbines draw power for start-up and to defrost), as a point December is a month when power is needed most for heating so demand is up - and anyone who knows the great British weather will know solar power isn't going to cover it in the winter months. Problem with Nuclear power is it doesn't "ramp" very well, that is attenuate to the decrease and increase in demand and normally gas powered stations are used as an interim until the nuclear power stations can get up to speed (more gas powered stations would be required to back up wind farms too to cover the peaks and troughs in output from them) and high-ramping gas stations aren't very ecological.
Diverting power to hydrogen facilities in times of low use and then back to the grid in times of high will help smooth out the ramping issues.
Another side benefit of hydrogen power stations is they can be used to desalinate and "clean" water ensuring there's enough clean water for everyone (water security being a crucial issue in the coming years as privatised corporations have made poor plans for the increase in demand in order to satisfy shareholders in the near terms by not spending the money needed for the long game).
So we have fuel, power, food & water for all the additional people. Taking back dessert space with GM farming will also offer new, green, areas for people to live and accommodate their living space needs.
The solution is easily within our grasp, it's just there's a lot of people in positions of authority that fear losing that position or are financially incentivised to ignore the solutions and breed fear amongst the people - that'll keep you in line.