The challenges of CCE are affected by social, political, and educational perceptions. An example of those could be Unesco’s 17 SDGs, which are politically drafted, may not always be the same, and are appreciated in all school and research societies. Societal value choices and the ways in which the media deal with conflicts between political interests and environmental problems impact the perceptions, attitudes, and values of both teachers and students, as well as perceptions about the division of responsibilities for action against the challenges posed by CC in the context of CCE
[52][27].
From an educational perspective, the ever-increasing amount of knowledge and the inconsistencies between different data sources make it difficult to stay up-to-date and increase suspicion concerning research data related to CC
[59][35]. Previous research has shown that teachers’ and student teachers’ knowledge of CC is incomplete, fragmented, and narrow, with many misunderstandings
[10,11,52,53,60,61][36][29][27][28][37][38]. The multidisciplinary nature of CCE is also often perceived as challenging and even intimidating
[11,62][29][39]. The implementation of CCE is often the responsibility of individual teachers
[11,54][29][30]. Increasing multidisciplinarity is hampered by challenges in teaching staff collaboration, such as the epistemic starting points and the pedagogical perspectives of teachers in different subjects, which are not always easy to combine
[61][38]. Addressing controversial issues such as CC can arouse strong opinions and feelings in both teachers and students and can therefore be an unpleasant experience for teachers especially
[60,61,62,63][37][38][39][40]. Teaching topics about CC is also hindered by the lack of appropriate teaching methods
[11,41][29][14] and teaching materials considered appropriate and functional
[62][39]. One key challenge is that very little attention is still paid in teacher education to the development of CCE and teachers’ competences in sustainability education, such as integrated problem solving, transformative learning, and learning or proactive competences
[8,9][15][26].
Achieving the goals of CCE is obstructed not only by the challenges and obstacles associated with teachers and teaching but also by various factors affecting students and learning. Students’ knowledge of CC has been found to be incomplete and to contain many misconceptions about, for example, the link between CC and other environmental problems, such as ozone depletion and environmental pollution
[10,11,52,53,64][36][29][27][28][41]. Learning science-based knowledge is important to alleviate CC anxiety
[51][25]. Students’ feelings and attitudes related to CC also pose challenges to CCE. Unaddressed negative emotions can manifest as, for instance, denial of CC, anxiety, apathy, or hopelessness, making it difficult to address climate issues
[26,62,64][42][39][41]. Ratinen and Uusiautti
[65][43] found that mitigation knowledge of CC among Finnish female upper secondary students was better than among Finnish male upper secondary students. Yli-Panula, Laakkonen, and Vauras
[66][44] showed with Finnish upper secondary students that the ability to learn about and solve CC issues is linked not only to topic knowledge but also to people’s beliefs regarding the topic, a result congruent with those generated by Leiserowitz
[67][45] and Poortinga et al.
[68][46]. The research by Yli-Panula et al.
[66][44] also revealed that upper secondary school students’ academic achievements are influenced by the structure and certainty of knowledge, as well as by the justification of knowing studied in relation to CC, which are results that are in line with those of Cano
[69][47] and Mason et al.
[70][48].
The nature of CC also poses its own challenges for CCE. Compared with many other environmental problems, the effects of CC are broader, less directly visible, and much more gradual, which makes it difficult to perceive the problematic nature of CC
[26,52][42][27]. Because of the holistic and multidimensional nature of CC, students can perceive the empowerment of the individual to be very limited
[52,62][27][39]. In addition, the huge amount of information and contradictions related to CC can confuse and frustrate students
[11,52,62][29][27][39].
All in all, CC is a controversial, multifaceted, and contextual concept and may not be easy to comprehend. For this reason, this study took into account what is provided in the Finnish national curricula for basic education (primary and secondary) [14] and upper secondary education [15] for teaching of CC at these school levels.
Community action by schools and educational establishments is essential for the development of CCE. This includes climate-responsible and climate-friendly activities and engagement by learners in shared goals
[11,53,71,72][29][28][51][52]. Of particular importance is the development of critical thinking skills and the perception of the need to change attitudes, beliefs, values, and practices that are detrimental to the climate. Future education and future visions are considered essential for the empowerment of individuals. The inclusion of the principles of CCE in teacher education is important, as is the development of teaching methods that will better support different students. In addition, it is important to increase cooperation between various sciences and other disciplines.