Should the world celebrate the 200th anniversary today of the birth of English naturalist Charles Darwin by working to limit the number of tourists visiting the Galapagos Islands or Antarctica to protect their spectacular wildlife?

Would that help elephant seals like this one above on the Antarctic Peninsula slumber more peacefully? And would it cause less disruption for marine iguanas, below right, on Santa Cruz island in the Galapagos?

The Galapagos in the Pacific Ocean gave Darwin insights into evolution on his famed voyage around the world aboard The Beagle. Many species — from mockingbirds to tortoises – differ from those on the South American mainland. For a story, click here.

And Antarctica, which wasn’t even discovered when Darwin was born on Feb. 12, 1809, is the world’s last big wilderness.

About 39,000 tourists are likely to visit Antarctica this current summer season, down from a record 46,000 a year ago and interrupting a fast-rising trend in the past couple of decades, according to the International Association of Antarctica Tour Operators. For a story, click here. Recession has hit bookings of trips that cost thousands of dollars.

IAATO says the numbers are tiny — enough people to fill a football stadium across a continent bigger than the United States.

But a group of environmentalists, the Antarctic and Southern Ocean Coalition, wants the numbers capped — it hasn’t proposed an exact figure, but says it shouldn’t be too far above current levels.

Among nightmare scenarios for Antarctica, first sighted in 1820, penguins might get bird flu. Or new seeds unwittingly brought by tourists might thrive and displace lichens and mosses found nowhere else on earth. A big cruise liner might run aground, spilling oil and coating beaches used by seals.

And the unique wildlife is of the Galapagos is similarly under threat from people with both tourism and immigration from the South American mainland. See a BBC report here, for instance, saying that tourism rose to more than 173,000 last year.

The United Nations in 2007 added the Galapagos to its list of world heritage sites in danger.

So should there be caps on visitors? If so, how many?

If not, how do we protect these unique places?

So “Lonesome George” might become a Dad?

In lists of endangered creatures such as black rhinos, orang utans, tigers or blue whales, ”Lonesome George” has long had the saddest status as the only one known survivor of the Pinta island species of Galapagos giant tortoise.

That has made him the “rarest living creature” for the Guinness Book of Records.

But now my colleague Alonso Soto in Quito reports that he’s mated with one of his two female companions of a similar species and keepers have found several eggs in his pen. If they hatch, they would at least preserve half of his genes.

Good on you, George! It would be an amazing turnaround after he has kept the species a heartbeat away from oblivion, showing little interest in sex in 36 years in captivity.

The Darwin Foundation has explained his problems by saying “he probably grew up alone and did not learn proper social and mating behaviour” even though he is in his sexual prime for a tortoise, aged about 60 to 90.

I visited the Galapagos Islands on a holiday in the late 1980s and went to Lonesome George’s enclosure –I can imagine that he was put off thinking of anything but survival because tourists were allowed to wander right up to him. The constant disturbances by people trampling around him can hardly have put him in a romantic mood. And maybe he’d been holding out in vain to meet an ideal Pinta mate?