Ever hear of Ocean Acidification?......... sure...current ph limited to 7.5-8.4
As far as your red bloom causes , NOAA is not linking it to our CO2  , just unusually warm water this year and last. You did hear about the El Nino didn't you ?
see: West Coast Harmful Algal Bloom @ http://oceanservice.noaa.gov/news/sep15/westcoast-habs.html
"While researchers are investigating the exact causes of the severity and early onset of the bloom, unusually warm surface water in the Pacific is considered a factor. "
The NYT was doing research for a op-ed called Our Deadened Carbon Soaked Seas    10/15/15
that was subject to a FOIA . It produced a e-mail that said there is no problem according to NOAA’s Dr. Shallin Busch
see emails here : Exclusive: Ocean acidification not a current problem, top NOAA scientist insists in FOIA-ed e-mails
Lake Erie's issues are with phosphorus , not CO2
SEE:http://lakeeriealgae.com/ 
thanks for coming out...cheers.