The number of times heads comes up when you toss a coin, number of students present in class, number of times a person has attended therapy sessions-these are all discrete variables. To help see the difference between continuous and discrete variables, imagine a really tall mountain with a trail leading up to the top.
Climate changes resulting from greenhouse gas increases could also significantly affect water supply and demand. For example, a local increase in temperature of several degrees Celsius could decrease runoff in the Colorado River Basin by tens of percent (25, 48).
The IPCC report showed that continuing to hold off on reducing emissions could increase costs by 40 percent if the delay leaves emissions 50 percent higher in 2030 than they are in ideal scenarios. Aside from delays in action, many other factors will increase costs. Costs will go up if countries donât all work together.