Middle Ages were warmer than today, say scientists.

A review of more than 240 scientific studies has shown that today's temperatures are neither the warmest over the past millennium, nor are they producing the most extreme weather - in stark contrast to the claims of the environmentalists.
The findings prove that the world experienced a Medieval Warm Period between the ninth and 14th centuries with global temperatures significantly higher even than today.
According to the researchers, the evidence confirms suspicions that today's "unprecedented" temperatures are simply the result of examining temperature change over too short a period of time.

Bom, quem sabe os gases emitidos pelos cavalos dos cavaleiros medievais (com ou sem trocadilho®) eram mais nocivos ao meio ambiente...