Talking about the future of farming has to address the fact that farming in a developed (ie: EU or North America) country/region may be different from farming in a developing (Africa, for example) country/region, even not counting for different shades of development over each area.
Some challenges will be similar, some will be different. It would be useful to see which are the greatest differences in challenges, because they may help us understand how certain solutions could/could not apply to all areas or only to certain ones.
For example, irrigation: there are developing countries which face a water/irrigation shortage now, while several developed countries will face water/irrigation shortage in the future (even in those cases where they already see signs of it, but are still able to do it.). That may require a different approach in how to tackle it. And so on.