Temperature of earth increasing. Why?

During the past century, the temperature of earth has increased by

The temperature falls with an increase in altitude at

Temperature of an ideal gas increases in:

When the temperature of a body increases

(A): The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. (R): On increasing temperature, conductivity of metallic wire decreases.

The reason for increase in electrical conduction of electrolyte with increase in temperature is A) increase in the number of ions B) increase in the speed of ions C) increase in the degree of dissociation of electrolyte

The recorded increase in the average temperatures of the earth’s atmosphere oceans is called -