It is ridiculous to say that in other times it was warmer. Nowadays we have many resources to measure, compare and identify the cause of the temperature rise an

It is ridiculous to say that in other times it was warmer. Nowadays we have many resources to measure, compare and identify the cause of the temperature rise and so far the best correlation is the increase of CO2 in the atmosphere. You're saying "Average temperature increases, it's not because of this theory, it's something else that no one knows." Denialists need to come up with a better theory instead of saying "natural causes not understood."