Sun bathing at the beach is very beneficial: earthing, vitamin D and biophotons. Majority of people re deficient in all three.

The earthing wikis:

+[WIKI] Earthing: Biological Effects

https://www.reddit.com/r/Electromagnetics/comments/3yyhwn/wiki_earthing_biological_effects/

+[WIKI] Earthing: Barefoot walking, barefoot running, winter earthing shoes and camping on the earth

https://www.reddit.com/r/Electromagnetics/comments/3yypnk/wiki_earthing_barefoot_walking_barefoot_running/

+[WIKI] Earthing: Plants

https://www.reddit.com/r/Electromagnetics/comments/3zbrtf/wiki_earthing_plants/

+[WIKI] Earthing: Testing earthing using a body voltage meter: Testing ground wire with a dirty electricity meter. Earthed mat, sheet and sleeping bag

https://www.reddit.com/r/Electromagnetics/comments/3yyv17/wiki_earthing_testing_earthing_using_a_body/

The biophoton wiki:

https://www.reddit.com/r/Electromagnetics/comments/43j6zu/wiki_biofield_measuring_body_emf_exposure_using/

Yes, everyone needs to worry enough about the harmful effects of mobile phones to keep them off when not using them:

https://www.reddit.com/r/Electromagnetics/comments/3wq9mr/wiki_mobile_phone_health_hazards/

EMF causing tumors and cancer and exacerbating cancer:

[WIKI] Cancer: EMF and RF exacerbate cancer

https://www.reddit.com/r/Electromagnetics/comments/42btj6/wiki_cancer_emf_and_rf_exacerbate_cancer/

[WIKI] Cancer: Conferences, censorship, etc.

https://www.reddit.com/r/Electromagnetics/comments/42bucm/wiki_cancer_conferences_censorship_etc/

[WIKI] Cancer: Power lines

https://www.reddit.com/r/Electromagnetics/comments/42br3e/wiki_cancer_power_lines/

[WIKI] Cancer: Radiofrequency (Cellular, cordless phones, wifi, bluetooth, zigbee and millimeter)

https://www.reddit.com/r/Electromagnetics/comments/42c5hn/wiki_cancer_radiofrequency_cell