3 ms·

What makes you think so? There's plenty of ways to indirectly know past temperatures, even if there wasn't a human writing it down.

• Udik 10y ago
  Not with the accuracy and resolution of the data we have since last century. When you compare the current time series with the reconstructed ones from the past, you're comparing a day by day thermometric reading with the assembled averages of multiple, very noisy and extremely low frequency samples. Very tricky to say from those what might have been the actual speed of change in the past.
  • euyyn 10y ago
    Tricky for sure, as in it requires scientists to understand statistics and probability. Thankfully, many do, and many university departments hire mathematicians to keep the quality there high.
  • deleted 10y ago
    [deleted]
  • mememachine 10y ago
    With the quality of data we have from the past your reconstruction can only be so accurate. Its not a stretch to say our reconstructions cant really predict the short term spikes were trying to compare against.