Could we control our climate?
Could we control our climate?

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

Could we control our climate?

3.4 Harmful algal blooms

Some CDR methods also have risks. One is rapid escape of stored CO2 into the atmosphere, reducing its effectiveness.

Iron fertilisation may harm marine ecosystems: for example, by creating ‘red tides’ of harmful algae (Figure 7). Such a red tide in 2013 was reported to have killed 276 manatees in Florida (Brown, 2013). Red tides also pose a risk to human health through eating contaminated shellfish.

This is a photograph of a 'red tide' in the ocean. It appears as a bright red fringe on the ocean very near the coastline.
Figure 7 A ‘red tide’ – the common name for a harmful algal bloom of toxic types of phytoplankton – this one is near Cape Rodney, New Zealand.
CC_1

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371