The type of leukemia that I am dealing with is treatable. So if I do what my doctors tell me to do - get my blood checked regularly take my meds and consult with my doctor and follow any additional instructions he might make - I will be able to maintain my good health and live my life with a minimum of disruptions to my lifestyle.
If we do not change our negative habits toward climate change we can count on worldwide disruptions in food production resulting in mass migration refugee crises and increased conflict over scarce natural resources like water and farm land. This is a recipe for major security problems.