A cartoon appearing in a recent newspaper shows two explorers bundled up in winter parkas reaching the North
Pole where they see a group of people playing volleyball in their bathing suits and sunbathing. Which
of the
following human activities has resulted in the phenomenon depicted in this cartoon?
O A. the burning of fossil fuels
B. further exploration of the Arctic
C. new species introduced to an ecosystem
D. slowed reproductive rate in developing areas