Remote sensing color image of harmful algal bloom in Lake Erie on October 9, 2011. The bright green areas have high concentrations of algae, which can be harmful to human health. The frequency and range of harmful blooms of algae are increasing.bedf8b57-6146-4e78-8aaf-defa8a1a03d3^,3325ef64-347b-4c33-9289-9e05e905dcbe Because algal blooms are closely related to climate factors, projected changes in climate could affect algal blooms and lead to increases in water- and food-borne exposures and subsequent cases of illness.3325ef64-347b-4c33-9289-9e05e905dcbe Other factors related to increases in harmful algal blooms include shifts in ocean conditions such as excess nutrient inputs.69d04f03-5ba1-46a6-a7e3-fa449d448bea^,bedf8b57-6146-4e78-8aaf-defa8a1a03d3^,3325ef64-347b-4c33-9289-9e05e905dcbe (Figure source: NASA Earth Observatory8c172cce-ec6c-417e-83fd-d646f79edfb4).