Inflation is the

general rise in prices over time
general reduction of prices over time
decline phase of the business cycle
decline in costs for a specific industry

Inflation is the general rise in prices over time.

Explanation:

In economics, inflation means a decline in the purchasing power of money and the resulting rise in prices, therefore the decline in the real value of money. It can also be defined as a general rise in prices to weaken the purchasing power of money.  

Inflation decreases the purchasing power of money, so that the same amount of money can no longer buy the same amount of products, services or labor, and monetary savings lose their value. On the other hand, the nominal value of real assets, such as real estate, is increasing. The opposite of inflation is deflation, that is, falling prices.

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.