I suggest you do some research on this. The temperature today is nowhere near as warm as the Medieval Warm Period or the Holocene maximim. If you look at the bigger picture it shows that we are simply coming out of the mini-iceage (Maunder Minimum) and can expect temperatures to plummet as the Holocene ends and the next glacial period begins. The temperature plot below over 13,000 years sums up the Holocene and shows how it can be expected to end.
