Although temperatures have fluctuated throughout the earth's history, scientists are greatly concerned about the current warming because a. wildfires are more severe and occur with greater frequency b. the sun is getting warmer which amplifies warming on the earth c. it is occurring at a more rapid rate than in the past d. clouds are not reflecting as much radiation now as in the past e. the ozone hole is allowing more radiation to enter the atmosphere

c. it is occurring at a more rapid rate than in the past

Explanation:

The rates at which the rise in the global temperatures are taking place is more alarming than in the past century and as the rise of the climate changes and the heat of the earth lands are becoming more and more progressively heats up and this continuing on a global and yearly basis as the water temperature have increased, the oceans are drying up and the tectonic plates are colliding and the rapid rise in the global patterns of the rainfall is also changing. The side effects of the man on the environment are also increasing day by day the global carbon cycle is getting out of balance and the search to find easy to sustain technology has not yet been made in the developing and the underdeveloped nations and earth is running out of fuel day by day.

Answerleveling;