Building trust in science and evidence-based decision-making depends heavily on the credibility of studies and their findings. Researchers employ many different study designs that vary in their risk of bias to evaluate the true effect of interventions or impacts. Here, we empirically quantify, on a large scale, the prevalence of different study designs and the magnitude of bias in their estimates. Randomised designs and controlled observational designs with pre-intervention sampling were used by just 23% of intervention studies in biodiversity conservation, and 36% of intervention studies in social science. We demonstrate, through pairwise within-study comparisons across 49 environmental datasets, that these types of designs usually give less biased estimates than simpler observational designs. We propose a model-based approach to combine study estimates that may suffer from different levels of study design bias, discuss the implications for evidence synthesis, and how to facilitate the use of more credible study designs.

Previous research indicates that complex biological concepts may be successfully introduced in preschool age, provided that suitable educational interventions are designed for the initial stages of education. In this regard, there is evidence that a basic understanding of the issue of the ecological interactions among organisms may be achieved in the preschool years. With this in mind, this research project tests the assumption that recognising the fact that plants and animals are not isolated creatures, but live engaged in constant interactions in nature, may begin to be understood in early education. To that end, this study examines the content of free drawings that a sample of 328 children aged four to seven years of age, undertook when explaining their understanding of plant life. Data regarding the type and frequency of the depictions of animals found in the children’s graphic explanations on flora is collected and read in conjunction with participants’ gender and academic level. The results show that a substantial proportion of the children in the sample spontaneously drew illustrations of animals in their graphic explanations concerning vegetable life and, more significantly, some pictures show plants and animals engaged in clear contact. This is the case, despite the fact that the drawing activity had been focused solely on the issue of plant life and no indication linked to depicting other kinds of living things mentioned during the activity. The conclusions discuss the data collected in connection with the growing number of research projects that study the question of how young children begin to embrace the fundamental biological concepts that pave the way to the understanding of natural phenomena and make the public capable of making responsible choices when it comes to sustainability issues.

Do young children think that plants deserve morally-based respect or, on the contrary, do they feel that respect for plant life is nothing more than another behavioural norm similar to, for instance, one that states that you should not pick your nose in public? This study examines how dilemmas involving environmental, moral and socio-conventional situations are comprehended in early childhood so as to investigate the issue of whether young children attach a significant degree of severity to transgressions against plant life in comparison with disregarding socially accepted rules. Additionally, young children’s judgements are put into perspective alongside their understanding of the concept of living things in order to shed light on the role that grasping essential biological notions might play in the emergence of young children’s assessments of actions that pose a threat to the environment. The sample of the study consists of 328 children (162 girls and 166 boys) who attend Early Years Education or Primary Education and the data examined comes from the individual interviews conducted with the children. The results are discussed in connection with the current understanding of the source of ethical judgements which emphasises the importance that emotions seem to play in the construction of moral thinking.

There is currently a growing theoretical discussion about the foundations that underlie the development of environmental awareness and nature care in early childhood. The aim of this study is to analyze how the environmental concerns of young children emerge and evolve during early childhood and whether these concerns are connected to an understanding of the biological notion of the living being. This study is designed to address methodological limitations of previous studies through a longitudinal axis and an extensive age sample. A sample of 178 children between the ages of four and nine participated at two different testing times for a period of one year. The methodology includes the categorization of various images of living beings and inert entities in order to analyze their understanding of living organisms. Dilemmas involving environmental, moral and socio-conventional situations are presented to examine and compare how young children view transgressions against plant life. The results reveal that young children’s judgments about environmental behaviors may arise before the development of an understanding of the concept of the living being. It is therefore proposed that this type of understanding does not support environmental awareness. Previous research indicates that complex biological concepts may be successfully introduced at the preschool age, provided that suitable educational interventions are designed for the initial stages of education. In this regard, there is evidence that a basic understanding of the issue of the ecological interactions among organisms may be achieved in the preschool years.

Los retos ambientales a los que nos enfrentamos requieren un cambio de comportamiento de las sociedades actuales y la educación puede jugar un papel muy importante en la estimulación de dicho cambio. Para diseñar programas educativos que impulsen un cambio de comportamiento hacia uno más pro-ambiental, es necesario analizar los factores que pueden determinar el comportamiento ambiental de las personas. Este trabajo pretende avanzar en la descripción de los factores que influyen en la conducta y toma de decisiones pro-ambientales a partir de una encuesta a personas en formación de diferentes edades. Los resultados mostraron que la conducta y toma de decisiones ambientales parece estar ligada a factores no necesariamente relacionados con el nivel de conocimiento, como pudiera ser el componente afectivo. Finalmente, se proponen estrategias para estimular la creación de vínculos afectivos con el ambiente y su problemática que contribuyan al desarrollo de una conducta pro-ambiental.