In the late 1990s the inner courtyard and the Reading Room were enclosed by a 2-acre (0.8-hectare) square glass roof, transforming this area into one of the largest covered public squares in Europe.
Researchers there have built a series of experimental patches linked with corridors by clear-cutting 27, 1.5-hectare squares in the midst of a pine plantation.
Based on the Ordnance Survey Grid, the study area was divided into 160 one hectare squares (100 m × 100 m).
702,430 hectares (7024 square kilometres, 2711 square miles) of farmland in the three provinces were destroyed by floods from Russ.
120,000 hectares (1,200 square kilometres, 465 square miles) of farmland were ruined, and irrigation facilities were damaged.
About 50,000 hectares (500 square kilometres, 195 square miles) of farmland was flooded, and more than 300 buildings collapsed during the storm.
One acre is equivalent to 0.4047 hectares (4,047 square metres).
Since independence in 1965 the country has expanded by 22%, from 58,000 hectares (224.5 square miles) to 71,000 hectares.
In 2004 some 2.8m hectares (10,700 square miles) of the Amazon were razed; last year only around 750,000 hectares were.This progress is not isolated.
The Czech government is at odds with the Roman Catholic church, which has been trying to get back over 200,000 hectares (770 square miles) of land.
