Community-based learning is a strategy or model of learning management that integrates curricular content into the community using work based learning to encourage learners to learn from real-life situations in the community under the participation of teachers, learners and people in the community. The purposes of this research were to develop environmental education learning plans for enhancing rivers management in the Northeast of Thailand using community-based learning as effective and effective, to study and compare knowledge, attitude and environmental ethics for enhancing rivers management in the northeast before and after study and to compare knowledge, attitude and environmental ethics for enhancing rivers management in the Northeast of students with different gender. The sample used in the study were 50 the third year undergraduate students in Environmental Education program, Faculty of Environment and Resource Studies, Mahasarakham University, which was derived by purposive sampling. The research tools were the environmental education learning plans for enhancing rivers management in the Northeast of Thailand using community-based learning, knowledge test, attitude test and environmental ethics test. The statistics used for data analysis were frequency, percentage, mean, standard deviation and hypothesis testing using Paired t-test and One-Way ANOVA. The results of the research showed that: 1) The environmental education learning plans for enhancing rivers management in the Northeast of Thailand using community-based learning were the efficiency of 81.08/85.43, the efficiency index was a value of 0.7709, it showed that the students have increased knowledge and resulted in the students progressing from their studies accounted 77.09%; 2) The students had average score of the knowledge, attitude and environmental ethics in the posttest higher than the pretest statistical significance (p < .05); 3) There was statistically significant different of score of knowledge, attitude and environmental ethics of students with different gender (p < .05).

The purposes of this research were to develop learning plans for dam management in the Northeast of Thailand using case study-based learning being efficient and effective, to study and compare the knowledge, attitude, and environmental ethics concerning dam management in the Northeast of Thailand before and after learning, and different gender. The sample was 72 2nd-year students in Environmental Education program, Faculty of Environment and Resources Studies, Mahasarakham University, being selected by purposive sampling. Research tools were learning plans for dam management in the Northeast of Thailand, knowledge test, attitude test and an environmental ethics test. The statistics used in the research were frequency, percentage, mean, standard deviation, Paired t-test, and One-way ANOVA. The results of the research were found that: 1) The efficiency of learning plans was equal to 86.38/84.17, and the effectiveness index of learning plans was 0.7466. It showed that the students increased knowledge and resulted in the students progressing from their studies as 74.66 percent. 2) After the learning, the mean score of knowledge, environmental attitude, and environmental ethics of students were significantly higher than before the learning at the .05. 3) There was no different knowledge, environmental attitude, and environmental ethics between students with an different gender.

The purposes of this research were to study and compare knowledge about Khok Hin Lad community forest, environmental ethics, and environmental volunteers from learning activities of undergraduate students before and after activities, to study and compare knowledge about Khok Hin Lad community forest, environmental ethics, and environmental volunteers of undergraduate students with different gender and GPAs. The sample used in the research was 99 second-year undergraduate students in Environmental Education, Faculty of Environment and Resource Studies, Mahasarakham University, which are derived from purposive sampling. The research instruments were a manual of environmental learning activities in Khok Hin Lad community forest by using area-based learning, knowledge test about Khok Hin Lad Community Forest, Environmental ethics test, and environmental volunteers test. The statistics used in the research were frequency, percentage, mean, standard deviation. And hypothesis testing using t-test, F-test (One – Way MANOVA, One – Way MANCOVA, and Univariate Test). The study found that: 1) The student's knowledge average score of Khok Hin Lad community forest, environmental ethics, and environmental volunteers after learning activities were higher than before the learning activities' statistical significance (p< .05). 2) There was no different knowledge of Khok Hin Lad community forest, environmental ethics, and environmental volunteers between students of different gender (p> .05). 3) There was no different knowledge of Khok Hin Lad community forest, environmental ethics, and environmental volunteers between students with different GPAs (p>. 05).

The purposes of this research were to develop environmental education learning plans to enhance wetland management in the Northeast of Thailand by using cooperative-based learning for being efficient and effective, to study and compare knowledge about wetland management in the Northeast of Thailand, attitudes and environmental ethics before and after learning of undergraduate students and to compare knowledge, attitudes and environmental ethics of undergraduate students with a different gender. The sample used in the research was 107 undergraduate students selected by purposive sampling in the 1st semester of the academic year 2020. The research tools were learning plans on wetland management in the Northeast of Thailand using cooperative-based learning, a knowledge test on wetland management in the Northeast of Thailand, an attitude test, and an environmental ethics test. The statistics used in the research were frequency, percentage, mean, and standard deviation, including hypothesis testing using Paired t-test and F-test (One-Way ANOVA). The results showed that: the efficiency of the learning plans on wetland management in the Northeast of Thailand using cooperative-based learning was 97.78/92.36 and the effectiveness index (E.I.) was 0.9430, indicating that the student&rsquo;s learning progress increased by 94.30%. The undergraduate students had an average score of knowledge about wetland management in the Northeast of Thailand, attitudes and environmental ethics in the post-test was higher than the pretest statistical significance (p &lt; .05). There was no difference in the knowledge score of wetland management in the Northeast of Thailand and attitudes of undergraduate students of different gender (p &gt; .05). And there was a statistically significant difference in environmental ethics of undergraduate students of different gender (p &lt; .05). Male&rsquo; score of environmental ethics about wetland management in the Northeast of Thailand was higher than females.

This study aims to study and compare stress level during the COVID-19 situation of undergraduate students with different gender and year levels. The sample were 276 undergraduate students in the 2nd semester of the academic year 2020, being selected by voluntary sampling. The tool was the stress level in the situation of the Coronavirus disease 2019 measurement form with online system Google from. The frequency, percentage, mean, standard deviation, including hypothesis testing using One-Way ANOVA were analyzed as the statistics. The finding showed that: 1) Undergraduate students’ stress level during the COVID-19 situation, almost of 118 students was a high level of stress, representing 42.75%, followed by severe level of stress, 107 students, representing 38.77%. The moderate level of stress was 45 students, representing 16.30%, and the low level of stress was 6 students, representing for 2.17%. 2) There was statistically significant different of stress level during the COVID-19 situation of students with different gender (p < .05). Female students’ stress level was higher than male students. There was no different of stress level during the COVID-19 situation of students with different year levels.