What humans specifically?
Well-off Californians or Londoners may say so and switch to an electric car and a powerwall at home.
People in rural China, in India, Pakistan, Indonesia, Malaysia, central Asia, central Africa care much more about putting some food on the table, and about having electricity, and about going around in absence of great public transport infrastructure. So they run thermal power stations, they burn coal, they drive gasoline-powered motorbikes, old Western cars and trucks, because they don't have a serious affordable alternative. They have more salient stuff to care about than penguins.
And they are, in total, literally half the world population.