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Paying for performance is however not an easy solution for organisational performance problems. As stated by Wright (1991: 16), "even the most ardent supporters of performancebased reward systems ...recognise that it is extraordinarily difficult to manage well". There is also a school of thought that rejects the claims made of performance-based rewards. A recent survey of British Telecom executives carried out by the Society of Telecom Executives (1991: 35) revealed that only 6 per cent of those responding to the survey thought that performance-based rewards improved their performance compared with an overwhelming 70 per cent who thought it had not. Research conducted by Carmen and Wood (1992: 8) on behalf of the Institute of Personnel Management and the National Economic Development Office into payment schemes, did not confirm that performance-based pay was a motivator. Face-to-face interviews were conducted with 40 personnel directors and managers from large and medium organisations. They concluded that the personnel managers interviewed were by no means certain that performancebased rewards succeed in motivating people. Most were not convinced they could unequivocally identify that performance-based rewards was increasing either individual or organisational performance. When these research findings are closely investigated, it can normally be established that specific reasons contribute to the failure of the performance-based reward systems to increase motivation and organisational performance. Armstrong and Murlis (1994: 252) believe these reasons are mostly: A failure to involve employees sufficiently in the design and implementation of the system; A mistaken belief that the performance-based reward system on its own will achieve the expected increase in motivation and performance; and The poor people skills of those managers that are responsible for managing implemented performance-based reward systems.
In order to better understand what controls carbonate weathering rates, we report results from the Jura Mountains （East France）, an area exclusively composed of carbonate rocks. This region presents ...an altitude gradient increasing from 250 m to 1300 m. Over the basin, this gradient generates climatic contrasts of 5℃ and a runoff three times higher in altitude. This place offers a good opportunity for understanding the controlling factors of carbonate weathering. Contrary to thermodynamic calculations that predict the highest concentrations at low temperature, we observe that carbonate dissolution is two times higher at low elevation than in the mountains. This observation can only be explained by a variation in soil pCO2. In order to better constrain the observed variation in cation contents （principally Ca and Mg） of rivers, we used the ASPECTS ecological model （Rasse et al., 2001）. Based on both hourly climatic data, vegetation type and soil type, ASPECTS may reconstruct pCO2 in soil.
Atmospheric carbon dioxide concentrations are believed to drive climate changes from glacial to interglacial modes, although geological and astronomical mechanisms have been invoked as ultimate ...causes. Additionally, it is unclear whether the changes between cold and warm modes should be regarded as a global phenomenon, affecting tropical and high-latitude temperatures alike, or if they are better described as an expansion and contraction of the latitudinal climate zones, keeping equatorial temperatures approximately constant. Here we present a reconstruction of tropical sea surface temperatures throughout the Phanerozoic eon (the past ∼550 Myr) from our database of oxygen isotopes in calcite and aragonite shells. The data indicate large oscillations of tropical sea surface temperatures in phase with the cold-warm cycles, thus favouring the idea of climate variability as a global phenomenon. But our data conflict with a temperature reconstruction using an energy balance model that is forced by reconstructed atmospheric carbon dioxide concentrations. The results can be reconciled if atmospheric carbon dioxide concentrations were not the principal driver of climate variability on geological timescales for at least one-third of the Phanerozoic eon, or if the reconstructed carbon dioxide concentrations are not reliable.
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