Environmental management and green brand for sustainable entrepreneurship

. The increasing competitiveness at the global market and reinforcing the ecological issues contribute the reorientation from the traditional to the sustainable business model. In this case, the business should develop the green brand of the company, which required the implementation of environmental management. The hypothesis of the paper is checking the linking between environmental management and green brand at the company. The results of bibliometrics analysis on the selected theme confirmed the increasing numbers of papers which focused on analysing the relationships between the efficiency of environmental management and green brand at the company. In the paper, the authors used the VosViewer with the purpose to visualise the main scientific patterns on the selected theme. At the second stage, the authors identified the relationships between green brand and environmental management at the company using the ANOVA model. The data for analysis was obtained from the questionaries among companies management (which promote as green companies) and companies' financial statements. The two indicators described the green brand: loyalty to the green brand (frequency of searching company's brand in Google); net profit. The findings proved that companies with effective environmental management had a higher net profit and loyalty to the green brand.


Introduction
The current trend of strengthening the ecological issues, promoting of Sustainable Development Goal 2030, increasing of global competitiveness provokes from the company the appropriate adaptations and changes considering the new trends.Thus, if companies wish to fix a stable position in the worldwide market, higher management should develop and implement the sustainable entrepreneurship model.It means that management should implement an environmentally responsible policy considering the main principles of sustainable development.Besides, the world-leading companies refused to work with the none ecological responsible companies which functioning without environmental management.Thus, the companies should reorient from eco destructive to sustainable entrepreneurship model.The findings proved that most investigations of the green brand and environmental management focused on the qualitative analysis without empirical confirmation.

Literature Review
The finding of the bibliometric analysis showed the increasing numbers of papers in Scopus which analysed sustainable entrepreneurship, green brand and environmental management from the 1991 year.The authors of the most cited paper [1] in Scopus (404 citations) confirmed that the marketing instruments to promote green brand had a positive effect on implementing the greener patterns of consumptions and productions.At the same time, the scientists in the paper [2][3][4][5][6][7][8]9] confirmed the hypothesis that sustainable entrepreneurship could not be realised without developing the green brand, effective environmental management, implementation of green innovations.The authors in the papers [10,11] confirmed the hypothesis that an effective system of environmental management could increase the company's performance.
Besides, the authors proved that sustainable entrepreneurship model allowed to increase the company's profit.The co-citation analysis allowed allocating of four clusters of scientist which analysed the selected issues (Fig. 1).The results showed that scientists from the United Kingdom, the United States of America and China published the vast numbers of the documents on the chosen theme (Fig. 2).
The first patterns (red) focused on analysing environmental management and contained 43 items.The second patterns (green) compiled the green economy and sustainability issues.The third patterns (blue) focused on investigating the green brand and marketing instruments.The next patterns (brown and orange) focused on analysing the principles of sustainable entrepreneurship and sustainable development.Besides, the brown patterns had the most significant numbers of links 177, which proved the analysis of sustainable entrepreneurship from different points of views.At the same time, most of the investigations had qualitative characters without empirical justification.In this case, it is necessary to do the empirical analysis of the green brand and environmental management as a core element of sustainable entrepreneurship.

Research methods
The general hypothesis of the paper was: H: exists the linking between the green brand and environmental management at the company.
For the analysis, the sub hypothesis was allocated.The model of the investigation was presented in Fig. 4.

Fig. 4. The hypothesis of the investigation Source: developed by the authors
The authors have chosen 150 Ukrainian companies for analysis which promotes itself as green companies.In the paper, the questionaries used for analysis the role and the efficiency of environmental management at the companies.Based on the findings of bibliometrics analyses the authors allocated the three indicators which described the efficiency of environmental management: implementation of environmental management and auditing system; implementation of corporate social responsibility; providing of green technologies and The authors estimated the green brand by two parameters: net profit (financial statements of the company); loyalty to the company's brand (frequency of searching the company's brand in Google).Three groups classified all companies relate on the scale (quantity of the workers and income): small; middle; large.The testing of the significant impact of environmental management on a green brand was done by using the ANOVA model.It technique allowed identifying the most significant variable among the analysis parameters.

Results
At the first step, the comparison of the companies scale for environmental management and the green brand was made.The results of the analysis showed in Table 1.Considering the finding, the non-significance variables were corporate social responsibility for small companies.Besides, on environmental management, the highest value for small companies were green technologies, for medium -green technologies and innovations, for large -corporate social responsibilities.At the next stage, the authors provided the ANOVA test (Table 2).
ANOVA test allowed identifying the significant factors which influenced the measures of the green brand.The findings confirmed the differences between the selected group of indicators for all analysed companies.It allowed concluding that analysed companies with environmental management have the highest net profit and loyalty to the green brand.
The statistically significant difference between analysed groups for large, medium and small companies for all findings were 0.01m level.Besides, the corporate social responsibility (CSR) had significant differences in net profit at level 0.10 for large companies and significant for loyalty to the company's brand at level 0.10 for medium and small companies.

Conclusions
The findings of bibliometrics analysis proved the increasing interests on the investigation of relationships between green brand and environmental management as the core elements of the sustainable entrepreneurship.The result allowed identifying the scientific patterns (environmental management; green economy; green brand and marketing instruments) on investigating the issues as mentioned above.The scientists from the United Kingdom, United States and Chine made a significant impact in the investigation on sustainable entrepreneurship from different points of views.
The results of the ANOVA test confirmed statistically significant differences between analysed groups of the parameters.It allowed confirming the hypothesis that environmental management had a statistically significant impact on the green brand.

Fig. 1 .Fig. 2
Fig. 1.The visualising of co-citation analysis of the scientists which investigated the sustainable entrepreneurship, green brand and environmental management Source: developed by the authors using VOSviewer

Fig. 3 .
Fig. 3.The visualising of bibliometric analysis of the papers which focused on sustainable entrepreneurship, green brand and environmental management Sources: developed by the authors using VOSviewer

Table 1 .
Comparison of companies scale for Environmental management and Green Brand * significances of < 0.05.

Table 2 .
The findings of the ANOVA test *,** -statistically significant at 0.01 and 0.10 significance level corresponding.