Similar to how you won't convince people to consume less fossil fuels because of climate change (because people couldn't care less about some far-away problem like climate change), you won't convince people of eating less meat to reduce the suffering of the animals either.

For renewable energy, people started mass-adopting it because solar energy simply got cheaper than fossil fuels and people are greedy and try to minimize their own cost of energy, which drives them to solar power.

The same is also true for meat consumption. Saying that meat production emits lots of CO2 is not going to change mass behavior. You need to focus on the health impacts of eating meat on the individual instead.

Eating lots of meat (especially red and heavily processed meat) is known to have disadvantageous health effects on the human who eats it. Among other problems, it causes high blood pressure which are directly causing cardiovascular health problems. That's why people have a personal incentive for their own good to eat less meat.

No it wouldnt.

No meal is worth the life of an animal.

I don't think that premise is true. I think most people who eat meat have at least a vague idea of how animals suffer to become food. Most probably don't know the specifics, and few will want to watch the videos showing conditions and procedures in factory farming, but it's not the knowledge that fosters empathy for animals. Humans are really good at disconnecting conflicting ideas becauseconflict makes us uncomfortable. They will say they prefer that animals suffer as little as possible to become food (or leather or sugar or pharmaceuticals, etc) but most humans won't change their behavior to match that stated preference.

It's the same way we feel about sweatshops or slave labor or child labor or the general exploitation of workers. The vast majority of humans don't want other humans to suffer, and most humans are at least aware that a child died to bring them that chocolate bar. That doesn't stop people from buying chocolate or fast fashion or bacon cheeseburgers.