Temperatures can increase without going in a straight line up (eg, last year may have been cooler than the year before, but it's still up overall and continuing

Temperatures can increase without going in a straight line up (eg, last year may have been cooler than the year before, but it's still up overall and continuing to go up). Saying what you said in your original comment is akin to, "Look, it's January and I just made a snowman, so much for global warming huh?".