Over the past two years, Caleb has been researching different forms of what?

In which type of vertical farming is a plant grown in nutrient-rich water?

What does Caleb use to monitor his crops?

What is the result of controlling climate and providing consistent light, food and temperature?

Caleb's technologies and consistencies allow him to produce food four to five times faster than who?

What are we facing right now?

What is the world's population at now?

What will the world's population be in 30 years?

How much more food will we need to feed all the additional people that will be coming in the next 30 years?

What can be harmful to land?

What does overused soil lose?

What do farmers use to treat their crops?

Where can the chemicals that farmers use to treat their crops get into?

Where can the chemicals that farmers use to treat their crops run off into?

What can threaten the ecosystem and the health of those living nearby?

When can people harvest fresh food from farms in urban areas?

With vertical farming systems, what do we not need to worry about?

What are sustainable?

With aeroponics, how much fresh water is reused?

All of the crops in an indoor farm are grown without what?

Where is the future of farming?