The ocean is now warmer from the solar activity increase since then, which peaked at the end of the solar modern maximum in 2004. (judithcurry.com)
This, however, does not necessarily mean that organic agriculture sets narrow limits to the use of modern maximum yield varieties, which are often chosen for pest / disease resistance purposes. (fao.org)
The best evidence in support of that proposition of slow long term solar background changes is the gradual and irregular change from Roman Warm period to The Dark Ages to the Mediaeval Warm Period and thence to the Little Ice Age and finally to our recent Modern Maximum. (newclimatemodel.com)