"The leopard cannot change his spots" is just a figure of speech.

“豹子改变不了身上的斑点”是个比喻，指江山易改本性难移。

《柯林斯英汉双解大词典》

It is ironic for the leading figure of climate-change opponents to quote this piece.

作为气候变化反对者的领军人物，引用这篇文章是很讽刺的。

youdao

There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can't figure out how to change people's habits.

一些基本的公共卫生问题，例如脏手而不是肥皂习惯，仍然是棘手的问题，仅仅因为我们无法弄清怎么去改变人们的习惯。

youdao

But they refused to commit themselves to a figure on helping developing nations battle climate change, saying they would wait to see what other countries offered first.

VOA: standard.2009.03.20

We're going to try and figure out how the price should change.

我们将要尝试去弄明白,这个价格会怎么变化。

麻省理工公开课 - 计算机科学及编程导论课程节选

Wal-Mart serves more than 100 million U.S. customers every week and a significant change in this figure is highly unlikely.

FORBES: Wal-Mart Can Swell To $80 Riding U.S. Growth

In August 2012, results indicated that uncertainty was rampant with about one third of the sample more optimistic, another third less optimistic, and the final third no change (see Figure 1).

FORBES: Bulls, Bears, and CMOs: Predicting the Future of Markets

The markets are broadly anticipating that the Federal Reserve will lower the fed funds rate, as well as the discount rate, by 25 basis points later this afternoon, and there is little reason to think Wednesday's GDP figure will change that.

FORBES: GDP's Health Misleading