Robert and Brenda Vale have written that owning a great dane does more damage then owning an SUV. These findings were published in their appropriately- titled new book, Time to Eat the Dog: The real guide to sustainable living.
Advise to those who want pets are to get those that are shared. If someone really wants one for themselves then chickens are recommended or those that serve another purpose such as laying eggs. The advice gets more gruesome later "rabbit is good. If you eat it."
Madness is often defined as the abandoning of reason but Ramesh Ponnuru correctly defines it when he wrote about Peter Singer and described him like the Hatter in Alice in Wonderland. Like Singer, these two are mad, but not mad in the sense that they have given up on reason. Rather, their madness is that they have given up on everything but reason.
Still, it is rather refreshing to see that enviromentalists don't simply have contempt for the millions of Africans that die every year due to the DDT ban. It does my heart good to see that they don't discriminate but hate others equally.