• Our story “CO2 figures break Kyoto vows” (8 October, p 7) may have given the impression that the Kyoto protocol sets a global target for CO2 emissions. However, only rich countries that ratified it are committed to cuts. Also, although developing countries such as China are catching up with rich countries, their contribution to global warming per head of population is still much lower. The average Chinese, for example, emitted 3.4 tonnes of CO2 in 2004 compared with 20 tonnes from the average American.
• We stated in the 1 October issue (p 6) that Surveyor 1 made the first soft landing on the moon in May 1966. While Surveyor 1 was a first for the US, the Soviet Luna 9 made the first ever soft landing on the moon about four months earlier.
