Healing the planet: Can we really prevent CO2-induced bad weather by building massive greenhouses to grow tomatoes in Minnesota in winter?

Cub Foods in joint venture of urban hydroponic greenhouse in St. Paul - TwinCities.com

Coming soon to a Cub Foods near you: fresh local produce, grown in St. Paul in February. ...St. Paul Mayor Chris Coleman joined BrightFarms CEO Paul Lightfoot; Chuck Lynch, Cub Foods senior vice president of operations; and U.S. Rep. Betty McCollum, D-Minn., on Monday, June 4, to turn the first shovelfuls of dirt at the future site of a new 38,000-square-foot hydroponic greenhouse.

...Lightfoot said consumers are embracing locally grown foods for a variety of reasons, including the opportunity to reduce pollution caused by trucking the goods long distances. The hydroponic greenhouse will take up less land and use less water than traditional field farming.

Flashback: How the myth of food miles hurts the planet | Environment | The Observer

Then there is the example of lettuces. In Britain these are grown in winter, in greenhouses or polytunnels which require heating. At those times it is better - in terms of carbon emissions - to buy field-grown lettuce from Spain.