Q.1. What percent of shade fabric for greenhouse? 2. Can I find a cover to protect an outside bush from birds?
My 14 x 14 greenhouse in SE Alaska has shelves 4′ above floor and vegetables suffer from radiation -floor plants are ok. What do I need for shade? Also, currants are ripening on bush and robins will eat soon. what do you recommend?

Certified GKH Gardening Expert
This extension fact sheet explains the variables to consider when purchasing shade cloth. For veggies, 20 to 40 percent is ideal.
https://extension.usu.edu/productionhort/files-ou/UsingShadeforFruitandVegetableProduction.pdf
This article will help with currant protection:
https://www.gardeningknowhow.com/edible/fruits/blueberries/protect-blueberries-from-birds.htm