How do dinosaurs become extinct due to climate change?

Well it is hypothesized that dinosaurs went extinct because a huge meteor crashed down to Earth. This meteor caused such a huge impact that it sent dust and particles of the Earth to go flying, reflecting and blocking the sun's rays. This caused the climate to go way down and the food source for the dinosaurs must have died because of the new climate. Thus, the dinosaurs didn't have anymore food and died of hunger