Apart from a few older men such as Bodkin there was no-one who remembered living in them—and even during Bodkin’s childhood the cities had been beleaguered citadels, hemmed in by enormous dykes and disintegrated by panic and despair, reluctant Venices to their marriage with the sea. Their charm and beauty lay precisely in their emptiness, in the strange junction of two extremes of nature, like a discarded crown overgrown by wild orchids.
The succession of gigantic geophysical upheavals which had transformed the Earth’s climate had made their first impact some sixty or seventy years earlier. A series of violent and prolonged solar storms lasting several years caused by a sudden instability in the Sun had enlarged the Van Allen belts and diminished the Earth’s gravitational hold upon the outer layers of the ionosphere. As these vanished into space, depleting the Earth’s barrier against the full impact of solar radiation, temperatures began to climb steadily, the heated atmosphere expanding outwards into the ionosphere where the cycle was completed.
All over the world, mean temperatures rose by a few degrees each year. The majority of tropical areas rapidly became uninhabitable, entire populations migrating north or south from temperatures of a hundred and thirty and a hundred and forty degrees. Once-temperate areas became tropical, Europe and North America sweltering under continuous heat waves, temperatures rarely falling below a hundred degrees. Under the direction of the United Nations, the colonisation began of the Antarctic plateau and of the northern borders of the Canadian and Russian continents.
Over this initial period of twenty years a gradual adjustment of life took place to meet the altered climate. A slackening of the previous tempo was inevitable, and there was little spare energy available to cut back the encroaching jungles of the equatorial region. Not only was the growth of all plant forms accelerated, but the higher levels of radioactivity increased the rate at which mutations occurred. The first freak botanical forms appeared, recalling the giant tree-ferns of the Carboniferous period, and there was a drastic upsurge of all lower plant and animal forms.
The arrival of these distant forbears was overlayed by the second major geophysical upheaval. The continued heating of the atmosphere had begun to melt the polar ice-caps. The entrained ice-seas of the Antarctic plateau broke and dissolved, tens of thousands of glaciers around the Arctic Circle, from Greenland and Northern Europe, Russia and North America, poured themselves into the sea, millions of acres of permafrost liquefied into gigantic rivers.
Here again the rise of global water-levels would have been little more than a few feet, but the huge discharging channels carried with them billions of tons of top-soil. Massive deltas formed at their mouths, extending the continental coastlines and damming up the oceans. Their effective spread shrank from two-thirds of the world’s area to only slightly more than half.
Driving the submerged silt before them, the new seas completely altered the shape and contours of the continents. The Mediterranean contracted into a system of inland lakes, the British Isles was linked again with northern France. The Middle West of the United States, filled by the Mississippi as it drained the Rocky Mountains, became an enormous gulf opening into the Hudson Bay, while the Caribbean Sea was transformed into a desert of silt and salt flats. Europe became a system of giant lagoons, centred on the principal low-lying cities, inundated by the silt carried southwards by the expanding rivers.
During the next thirty years the pole-ward migration of populations continued. A few fortified cities defied the rising water-levels and the encroaching jungles, building elaborate sea-walls around their perimeters, but one by one these were breached. Only within the former Arctic and Antarctic Circles was life tolerable. The oblique incidence of the sun’s rays provided a shield against the more powerful radiation. Cities on higher ground in mountainous areas nearer the Equator had been abandoned, despite their cooler temperatures, because of the diminished atmospheric protection.
It was this last factor which provided its own solution to the problem of re-settling the migrant populations of the new Earth. The steady decline in mammalian fertility, and the growing ascendancy of amphibian and reptile forms best adapted to an aquatic life in the lagoons and swamps, inverted the ecological balances, and by the time of Kerans’ birth at Camp Byrd, a city of ten thousand in Northern Greenland, it was estimated that fewer than five million people were still living on the polar caps.
The birth of a child had become a comparative rarity, and only one marriage in ten yielded any offspring. As Kerans sometimes reminded himself, the genealogical tree of mankind was systematically pruning itself, apparently moving backwards in time, and a point might ultimately be reached where a second Adam and Eve found themselves alone in a new Eden.
Rigg noticed him smiling to himself at this conceit. “What’s amusing you, Robert? Another of your obscure jokes? Don’t try to explain it to me.”
“I was just casting myself in a new role.” Kerans looked out over the ramp at the office blocks sliding past twenty feet away, the wash from the cutter splashing through the open windows along the water-line. The sharp tang of wet lime contrasted freshly with the over-sweet odours of the vegetation. Macready had taken them into the shadow of the buildings and it was pleasantly cool behind the breaking spray.
Across the lagoon he could see the portly bare-chested figure of Dr. Bodkin on the starboard bridge of the testing station, the Paisley cummerbund around his waist and the green celluloid shade shielding his eyes making him look like a riverboat gambler on his morning off. He was plucking the orange-sized berries from the ferns overhanging the station and tossing them up at the cluttering marmosets dangling from the branches above his head, egging them on with playful shouts and whistles. Fifty feet away, on a projecting cornice, a trio of iguanas watched with stony disapproval, whipping their tails slowly from side to side in a gesture of impatience.
Macready swung the tiller, and they pivoted in a fan of spray into the lee of a tall white-faced building which lifted a full twenty storeys out of the water. The roof of an adjacent smaller block served as a jetty, next to which was moored a rusty white-hulled power cruiser. The raked perspex windows of the driving cabin were cracked and stained, and the exhaust vents leaked a scaly oil on to the water.
As the cutter jockeyed in behind the power cruiser under Macready’s expert hand, they clambered over to the wire door, jumped down on to the jetty and crossed a narrow metal gangway that led into the apartment block. The walls of the corridor were slick with moisture, huge patches of mould feeding on the plaster, but the elevator was still working, powered by an emergency diesel. They rose slowly towards the roof, and stepped out on to the upper level of the duplex, then walked down a service corridor to the outer deck.
Directly below them was the lower level, a small swimming pool with a covered patio, bright deck-chairs drawn up in the shade by the diving board. Yellow Venetian blinds masked the windows around three sides of the pool, but through the vanes they could see the cool shadows in the interior lounge, the glint of cut-glass and silver on the occasional tables. In the dim light under the striped blue awning at the rear of the patio was a long chromium counter, as inviting as an air-conditioned bar seen from a dusty street, glasses and decanters reflected in a diamond-paned mirror. Everything in this private haven seemed clean and discreet, thousands of miles away from the fly-blown vegetation and tepid jungle water twenty storeys below.
Beyond the far end of the pool, screened by an ornamental balcony, was a wide, open view of the lagoon, the city emerging from the encroaching jungle, flat sheets of silver water expanding towards the green blur along the southern horizon. Massive silt banks lifted their backs through the surface, a light yellow fur along their spines marking the emergence of the first giant bamboo groves.
The helicopter rose from its platform on the roof of the base and arced upwards into the air towards them, the pilot swinging the tail as he changed direction, then roared overhead, two men in the open hatchway searching the rooftops with binoculars.
Beatrice Dahl lay back