## 4 Discussion  
### Findings in Comparison to Previous Reviews  
In recent years, a large number of reviews have been published on the topic of forests and climate change. Some of them are limited to remote sensing methods, and others deal with other data sources and methods in the context of forests and climate change. In the following section, the main findings of this review are summarized and, where possible, discussed in relation to the findings of other reviews. The focus of this review was on temperate forests. We were able to show that research on this ecosystem is only carried out by countries that cover temperate forests. It was noticeable that, with the applied method, we could not identify any publication from or about Australia, New Zealand, Chile, or Argentina. Many recent reviews discuss the possibilities of monitoring tropical forests with RS, focusing more on direct anthropogenic impacts and degradation [216; 217; 218; 219]. In contrast, research on temperate forests has been investigating the effects of EWEs using remote sensing data for some time. Fifteen years ago, [PERSON] et al. [220] summarized the potential of spatial data for research on forest degradation and regeneration. The very recent review by [PERSON] et al. [58] summarizes the current challenges, considerations, and directions of remote sensing in forestry. Even more detailed evaluations of the remote sensing data used can be found in [PERSON] et al. [221; 222]. The authors examined the development of remote sensing research on German forests. In principle, the two reviews are much more spatially limited and have a broader focus. They revealed an increasing interest on studies of disturbances, most of which are directly or indirectly caused by climate change and its consequences. The shift towards disturbance studies is accompanied by a shift towards timeseries analysis. In fact, in our review, timeseries account for more than three quarters of all studies, because climate changes and EWEs tend to occur over longer periods of time and their effects evolve over several years. Since, with the exception of Landsat, long-term series are only available from satellite systems with low spatial resolution, systems with pixel sizes more than 30 m predominate in our review, accounting for more than two thirds of the sensors used. The proportion of publications not using satellite data is less than 8% in our review, and is distinctly higher in reviews with limited spatial scope [221; 222]. The wide range of multispectral satellite systems available offer the opportunity that observation gaps can be filled more and more effectively. Therefore, optical data were used in more than 96% of the studies in our review. This is also reflected in the general distribution of the use of Earth observation satellite data in publications worldwide, where, e.g., optical data clearly outnumber radar data [94]. Similarly, there is already a large collection of reviews from recent years that address the increasing pressure on forests due to climate change without focusing on remote sensing data and methods. [PERSON] et al. [223], for example, focus on the ecological consequences of combined disturbances in forest ecosystems, [PERSON] et al. [224] examine studies on the effects of drought on biodiversity, [PERSON] et al. [225] analyze publications on the effects of climate change on tree growth as well as on crises and management strategies for European forests, [PERSON] [226] also deals with the adaptation of forest management to climate change, and [PERSON] et al. [227] asks the general question whether forest management can adapt to the uncertainties of climate change in the 21 st century. All of these reviews and studies emphasize the problem of water scarcity, mostly caused by droughts. This is reflected in the above-average attention given to the issue. More than 70 of the 126 publications used deal with the effects of droughts on forests. The focus on drought is not surprising.