Why does Gore call information about climate change “an inconvenient truth”?

Stating that climate change is inconvenient truth means it is not a pleasant thing and it has a negative effect, yet it is something objectively happening.

Explanation:

Climate change is, as Gore explains it, very disturbing for the planet and the living things, and something that affects us all. It changes the quality of our lives, but, more importantly, it destroys Earth and nature.

It is not a pleasant fact, and more so because humans are the ones who made most of the errors that cause climate changes. This is why it is “inconvenient” – no one wants it to be happening and it’s a difficult thing to grasp.

Yet, it is the objective fact that climate changes are happening and we must acknowledge them, no matter how unpleasant this is. No matter how inconvenient this truth is, it is a real threat.

Only by realizing the reality can humans do something about to problem, stop the climate changes, and save the environment, which’s the state is decaying every day.

my best guess would be: d allusion

makes the most sense