The processes that are capable of producing the significant and long-lived increase in global temperatures of the 20th century are;
increases in greenhouse gases
changes in Earth's orbit
volcanic eruptions
What are the processes?
Several processes have the capacity to produce long-lived increases in global temperature. Some of these would include increases in greenhouse gases. These gases are produced by man's activities in industries and are capable of causing global warming.
Also, volcanic eruptions happen on a large scale and can cause a heating up of temperatures.
Complete Question:
Which of these processes are capable of producing the significant and long-lived increase in global temperatures of the 20th century? Multiple select question. increases in greenhouse gases La Niña plate tectonics El Niño changes in Earth's orbit volcanic eruptions